(Deeper planting yields a more drought-resistant plant, too.) To do this, plant leeks into deep holes. You could continue harvesting leeks until they are locked frozen into the ground, but don’t let that happen. To improve the soil if you haven’t thought that far ahead, mix in a few inches of Miracle-Gro® Performance Organics® All Purpose In-Ground Soil with your native soil. Contr… If possible, add compost to the leek bed the season prior to planting. Leeks have a long growing season, typically 120 to 150 days, so start seeds indoors in February or March or about two months before the last frost date in zones that endure some frost, such as zone 6 and colder. No need to back-fill the planting holes with soil. To freeze leeks, wash, slice, and blanch for 1 minute in boiling water. So much to grow, so little time. Harden off the plants for five to seven days before transplanting by putting them in a cold frame. Leeks prefer … However, American flag will over winter in Zones 7 and warmer, easily tolerating temperature in the teens. Before transplanting your young leeks make sure you’ve acclimatized them to outdoor conditions by leaving them outside for increasingly longer periods over the course of one to two weeks. You can increase your soil’s organic matter content by adding well-rotted manure or compost in spring or fall. Space leeks 6 inches apart in an area that gets 6 or more hours of sun daily and has nutrient-rich, well-drained soil. Harvest leeks at any time once they are large enough to eat. Leeks can be grown from seeds or transplants. You can start transplants in a trench 6 to 8 inches deep. There are two types of leeks: non-hardy or early leeks that reach full size in 50 to 75 days, and the hardy types that take 100 days or more The hardy ones are good for storage and in many places they can even be left right in the ground over the winter, especially if you mulch them with leaves or straw. As the plants develop, raise the soil level along the stems up to the leaves, gradually filling the furrow. Leeks aren’t fussy, but they do require moist soil, so check soil moisture often and use a soaker hose if necessary. They’re ready to transplant when they are six to eight inches (15-20cm) tall. I always leave some leeks in the garden to set seed. Leek roots are fibrous and shallow. Add the frozen leeks to soups, stews, and other dishes. After a couple of weeks, there is obvious growth as you can see in the picture below. Wash the stems thoroughly to remove soil and grit that may have collected between the leaves. © porrum), a relative of onion and garlic, is grown for its mild-flavored stalks that are commonly eaten raw or included in soups or quiches. ‘Toledo’ AGM: This leek produces long stems with dark blue leaves and is a late season cultivar, ready … Personally, I just plant deeply in the beginning and don’t bother doing anything else with my leeks. This will yield the desired long, white stems. Leeks have many of the same pest problems as onions. Some smaller varieties mature at one-half to three-fourths of an inch diameter. Leeks have shallow root systems. Use a liquid plant food when you water to encourage fast growth that will result in tender stems. Leeks need two things to thrive: lots of nitrogen and consistent soil moisture. The other growing option is to plant the seedlings like onion transplants and hill up around the stems as they mature. Most leek varieties fully develop when the stem width is bigger than one inch. When growing leeks from seeds, it’s often easier to start them indoors even though they’re considered cold tolerant, as hard frosts can be detrimental to young plants. These root ends are great to watch when you are washing the dishes and a pretty addition to the windowsill in winter! University of Minnesota Extension discovers science-based solutions, delivers practical education, and engages Minnesotans to build a better future. You can also grow leeks in containers. Leeks are most famous for leek and potato soup, but they’re also good steamed like asparagus, oven-roasted, chopped in quiche, or wrapped in ham and baked (perhaps with a little cheese on top). Mulching is essential in warm climates. Mound mulch around your leeks to protect them, and you can enjoy digging fresh vegetables out of your garden into late fall. Water leeks as needed until plants are established. Grace your dinner table with an easy-to-grow, elegant onion cousin: the leek. Do not use fresh manure as it may contain harmful bacteria and may increase weed problems. Extension is expanding its online education and resources to adapt to COVID-19 restrictions. Leeks require 120 to 170 days to reach harvest depending on the variety. For short-term storage (up to one week), tuck stems into an airtight plastic bag and place in the refrigerator crisper. One thing leeks do like is a little bit of room for their roots to spread. Use a trowel to see how far down the soil is wet. Most leeks mature 100 to 120 days after sowing the seeds, but a few varieties mature in as few as 60 days. On young plants, slugs can be devastating. They grow well in raised beds, containers, and in-ground gardens. You can strip away the leaves and eat what white part of the stems is left below the leaves. Scatter the seed thinly on the surface, cover with a … When you are ready to plant the leeks outdoors, choose the best container for the leeks to grow in. Use good cultural control practices to reduce disease problems to a good level and allow for a successful harvest. The leaves are thick, flat and folded. If your soil is sandy, it is better to water more often than once a week. When inspiration grows all around you, you can’t help but create masterpieces. An inch of water will wet a sandy soil to a depth of ten inches, a heavy clay soil to six inches. Miracle-Gro® Performance Organics® All Purpose In-Ground Soil, Miracle-Gro® Performance Organics® Raised Bed Mix, Miracle-Gro® Performance Organics® Edibles Plant Nutrition, Miracle-Gro® Performance Organics® All Purpose Container Mix. If they resist, use a spading fork to loosen soil and then gently pull leeks by grabbing them at their base. At that time, I pick one or two stalks and put them upside down in Method 2 – Growing Leeks In Containers. After that, plants require an inch of water a week, either through rainfall or irrigation. These plants are survivors, able to exist with little soil and virtually no water. Even though it is the cools season, do not allow leeks to stay in dry soil for too long. Water well. Leeks have shallow root systems and need plentiful watering. As you can see, a majority of carrot varieties take 70 to 80 days to grow. If you transplanted your leeks into holes, you will need to push the soil up around them approximately 2” at a time until the leeks are ready to harvest. No, this is an exception to our plant-the-pot rule. Too much water can lead to fungal diseases. The top growth, called the flag, should be dark blue-green. porrum) are a gourmet vegetable that you can grow easily in Minnesota. If it is only an inch or two, keep the water running. The University of Minnesota is an equal opportunity educator and employer. Although some of the newer cultivars have been bred for quicker maturity – three to four months – maturity times are often affected by temperature, available nutrients and water. Leeks grow best in temperature between 55° and 75°F (13-24°C). 2021 Sweet and mild, leeks are gentle on the digestive system and play the role of onion in dishes, only toned down. After planting, mulch the bed with straw or some other organic material to help soil retain moisture. Growing tips Leeks need regular watering and an application of seaweed tonic every two to three weeks to provide them with iron and... Leeks have fragile shallow roots, so always weed around them by hand. Space leeks 6 inches apart in an area that gets 6 or more hours of sun daily and has nutrient-rich, well-drained soil. They grow well in raised beds, containers, and in-ground gardens. Harvest leeks by either gently twisting and pulling them from the earth, or digging and lifting them. Dig them first and store. Find your favorite — try our interactive tomato chooser! When you see a Bonnie Harvest Select plant, you should know that it has success grown right into it-helping you get a head-turning harvest and mouth-dazzling taste. As the plants grow, fill the trench with no more than 1 inch of soil at a time. That’s another reason why a … As leeks grow, mound the soil from the trench around stems, beginning when stems are 1 inch thick. Place stems in a box (root side down) and pack with sawdust, clean sand, or vermiculite. You can start pulling leeks from the ground just about anytime. Yes, you can grow them in containers. At this point, dig them because they will throw up a bloom stalk that ruins the fleshy texture of the stem. Stems will keep up to 8 weeks. Cultivate just deeply enough to cut the weeds off below the surface of the soil. Set transplants at the bottom of a six-inch deep furrow. You will also run into what is called a “summer leek” which is intended to plant in spring and harvest before cold weather. Plants grow two to three feet tall, and can have a width of two inches. If doing this, be sure to space them out a bit. If the filling is done too fast, the stems may rot. Soil that tumbles into leaf folds can wind up trapped between skin layers in the stem. Inconsistent moisture yields tough stems. Leeks (Allium ampeloprasum var. To keep this from happening you can slip a section of paper tube, such as from toilet tissue or paper towels, over the plants while they are still young as early as planting time. Depending upon your climate, you could be harvesting leek plants from late summer until early spring. Leeks are fairly frost tolerant, so you can delay harvest until after the first few frosts. You can eat both the green leaves and the white shaft. Sow the seeds in individual pots for easier transplanting about six to eight weeks before growing season or in early spring. Because they are so cold-hardy, you could find that you still have leeks left in the garden that have made it though the winter, planted many months before. Starting the Seeds Plant in the fall or spring, depending on your climate. Get gardening info on the go with our free app, HOMEGROWN with Bonnie Plants. Leeks are great in soups, steamed or stir-fried. While they will still grow well in clusters of 2-3 plants, much more than that and they won’t thrive. In colder areas, extend the harvest season by mulching deeply around plants (up to 1 foot deep) before a hard freeze. ‘Apollo’ AGM: A mid-season cultivar, ready to harvest in about December with blue-green leaves and good rust resistance. Cut leaves back until just an inch of green remains on each leaf. Drain, drip dry, and toss into plastic freezer bags. And it’s blessed with the best upbringing a young plant can have: Miracle-Gro Head Start. Many Minnesota soils have enough phosphorus. In northern climates, start seeds indoors in late February or March. On one Show day, two old guys were standing talking and I heard them say “his dad grew all them.” Trim the leaves to a more manageable length at harvest, if desired. Leafy stems are pretty, and growing leeks doesn’t require much room in the garden. They have a mild onion flavor. Trim the roots of the transplants to one inch to help you transplant, if necessary. Continue filling as the stems grow so that they will blanch. At this point there is not much you can do except pull the rotted plants and thin the planting to increase air circulation. Very large leeks have an inferior flavour so don't let them get too big. Most leeks require a long growing season of about 120 to 150 days, and a minimum of eight hours of bright sunlight daily. One week after planting, begin regularly feeding with a water-soluble plant food. Bold colors. Most leeks require a long growing season of about 120 to 150 days. A quality leek should have a firm, white shaft more than three inches long. Keep the packing moist and store in a cool place. Or, if planting in raised beds or containers, be sure to fill them with the right type of soil for that growing environment, such as Miracle-Gro® Performance Organics® Raised Bed Mix for raised bed gardens and Miracle-Gro® Performance Organics® All Purpose Container Mix for pots. New varieties. When seedlings have three leaves each, about four to five weeks later, thin to leave plants every 15cm - the seedlings you remove could be used to plug gaps elsewhere. I have been multi-sowing many vegetables since the 1980s, and lately the method has become popular. Mulching with herbicide-free grass clippings, weed-free straw or other organic material to a depth of three to four inches can help prevent weed growth, decreasing the need for frequent cultivation. For assistance in diagnosing unknown problems, visit the University of Minnesota Extension diagnostic site “. The leeks have begun to regrow, with their green leaves growing upwards. Make sure your leeks are getting at least a half dozen hours of good sunshine most days. Some types may take more than four months to mature. Temperatures as low as 20°F may not harm some varieties. Plant two to six inches apart, with 12 to 36 inches between rows. Leeks are a delicious vegetable with a long season and will provide food from August through the winter. Leek ends in a bowl of clean water. Unless your soil test report specifically recommends additional phosphorus, use a low- or no-phosphorus fertilizer. In the case of drought, water deeply once a week. Improve native soil by mixing in several inches of aged compost or other rich organic matter. Unlike the cousin the onion, leeks don't die back and signal they are ready to harvest. To produce long white shafts, some gardeners plant leeks in furrows. Otherwise - make holes with a dibble or suitable stick 15 cm (6 in) deep and 3-4 cm (1.5 - 2 in) wide. Water the soil when you irrigate, rather than the leaves of the plant. With plants like these, I always plan cautiously and expect things to take slightly longer than expected. The free gardening app you've been waiting for. In their second year, each grows a lovely starburst cluster of tiny whitish flowers on a long and delicately twisted stem. Many chefs believe that the best leeks have large, long white stalks so many farmers actually hill up around their leeks as they grow to blanch. Plant leeks during the cool weather of early spring and fall. The long, blanched stems, also known as shanks, can be eaten young and tender, or allowed to mature. Step 1. Unlike their onion and shallot cousins, leek tops do not die back as the crop matures. Leeks grow best in full sun but will tolerate part shade ... • Aim for a blanched section at least 10-15cm long. How long have you been growing leeks? Take care not to damage them by hoeing close to the plant. If you do not have a cold frame, set them outside for longer periods each day while returning them to the shelter of your home or garage at night. Sempervivums, hardy succulents of the family crassulacae are usually referred to as house leeks, or sometimes as live forever, or occasionally hen and chickens. Exciting flavors. Thoroughly clean leeks before cooking. The stems are ready to harvest September to November. All rights reserved. Use a container about 18 inches deep and fill it only about 2/3 full of soil to begin with. This spacing will make the best use of space, light and air circulation. If there is a lot of rain in winter or early spring, leaf rot can set in. As they grow, watering will gradually fill the hole. Its shanks are long and narrow and taste like mild spring onions. Remove affected foliage; later maturing foliage will be healthy. Space leeks 6 inches apart when planting. Quick Guide to Growing Leeks. Grow leeks from transplants started indoors or from seed sown directly in the garden. Fill pots or seed trays with good quality, multi-purpose compost and firm gently. In mid-summer, side-dress with a balanced fertilizer such as 10-10- 10 at a rate of one cup per 10 feet of row. How to grow leeks from seed. The botanical name sempervivum comes from the Latin word ‘semper’- meaning forever, and ‘vivus’ meaning living. There are others that take a bit longer but you can totally go with these to enjoy your carrots a bit earlier. Leeks can take between 25 - 40 weeks to mature depending on the time of year you sow them. A transplant solution of half-strength 20-20-20 or 10-10-10 fertilizer will get the plants off to a good start. Leeks are tolerant of cold, so you can delay harvest until after the first frosts. Plant leeks in a sunny spot in soil that is fertile and well-drained. Hill the plants to produce a longer white shaft, or plant in a furrow and fill it in. • Large mature leeks may require a garden fork to help lift them out of the ground. Leeks thrive in traditional garden beds, raised beds, or even in tall containers, so choose whatever works best for you. Another method is to hill the plants by planting them at normal soil level, then mounding compost or soil around the plants several times during the growing season. Gently separate the seedlings to plant. Mulch the … For longer storage in coldest zones, dig leeks with roots attached. Transplants should be no more than 10 to 15 weeks old when set out in the garden. across. Germination of Leeks. You may eat them in soups, as well as raw, braised or in casseroles or quiche. Feed newly planted leeks with Miracle-Gro® Performance Organics® Edibles Plant Nutrition every seven days. American Flag, the heirloom variety that we offer, is one of the most cold hardy. In warmer climates, you can direct sow leeks. Drop a seedling in each and water enough to cover the roots with soil. Some newer cultivars require as few as 90 days to maturity, and these may be most suitable for Minnesota conditions. Do not use any fertilizer containing a weed killer ("Weed and Feed"), as it may kill your vegetable plants. "Swiss Zermatt", for example, is an early maturing leek that's ideal for growing as a gourmet baby leek. Gather them at night, set traps, or use biological control. If you’ve chosen to grow your leeks in a trench, simply gradually fill the trench with soil to the bottom of the lowest leaves periodically until your plants have finished growing. Our pots are sown thickly with leek seedlings, which means you get a lot in one pot. In a pinch you can use a grow light to help boost the ‘sunlight,’ your little leeks need to grow. Most varieties of leeks require a fairly long growing season of 120–150 days, although some modern cultivars have been bred for shorter seasons lasting about 90 days. Swelling at the base, called "bulbing," is undesirable. The green portions are actually edible, but they won’t be as tender. In zones 7 and warmer, you should be able to harvest leeks all winter long. Growth will be slowed by hot weather. For the healthier leeks, you will need a … This will prevent the soil from becoming compact, which would allow the leeks to grow easily. Spread the fertilizer alongside the row, about six inches away from the plants, and scratch it into the soil. In summer, orange pustules on leaves indicate leek rust, which is worse in wet growing seasons. As the plants grow fill the trench. Leeks look like overgrown green onions, with a long, cylindrical white shaft. I got into growing leeks 19 years ago when a local club started a leek show, I won nearly every class at the beginning of the shows. Plant leeks during the cool weather of early spring and fall. Find out more, or download it now for iPhone or Android. To produce a succulent white stem, leeks must be blanched — in other words, covered or hidden from the sun. They will produce the best yields and quality if supplied with enough water, whether by rainfall or irrigation. Leeks can take up to six months to mature after transplanting. Leeks grow best in well-drained soil with pH between 6.0 and 7.0, and high organic matter. Unlike onions, leeks don’t produce bulbs but stash their flavor in thick, juicy stems that look similar to giant scallions. You can begin harvesting your leeks when still quite small to achieve a long cropping season. How to water leeks? The leek (Allium ampeloprasum var. 2. Use a container with an 8- to 10-inch diameter and a volume of about 2 to 3 gallons. Regents of the University of Minnesota. Begin the harvest when the stalks are about an inch (2.5 cm.) Enjoy dabbling in the diversity of deliciousness you’ll find in our Foodie Fresh collection. Frequent, shallow cultivation will kill weeds before they become a problem. Create a narrow trench 6 to 8 inches deep, then tuck seedlings into the trench, adding soil back so it comes up to the base of the first green leaf. Transplant leeks as soon as early spring weather has calmed down and daytime temperatures are at least 45°F. Once the florets are open, it takes three to four weeks before the tiny black seeds mature. The tube will rot over the growing season, but will help prevent soil from getting into leaf bases during early growth. This ensures you'll have them in the ground with ample growing time. In the supermarket, leeks cost a premium; harvested from the garden, they’re a bargain. Rot shows as white spots on leaf tips that eventually shrivel. Apply phosphorus (P) and potassium (K) according to soil test recommendations. Typically, you’d let them get least 1 inch or larger in diameter for the big white stems, but you can dig young ones to eat like scallions. Planting leeks deeply will help them develop better stalks for cooking. They will, gradually, fill up when you water. Hill the plants to produce a longer white shaft, or plant in a furrow and fill it in. Flag will over winter in zones 7 and warmer, easily tolerating temperature in the teens hoeing... This is an early maturing leek that 's ideal for growing as a gourmet baby leek dabbling! Aged compost or other rich organic matter when stems are 1 inch of water a week folds wind... Pulling leeks from the ground just about anytime unknown problems, visit the University of Minnesota Extension diagnostic “. Firm, white shaft have shallow root systems and need plentiful watering begun to regrow, with a season... Seed trays with good quality, multi-purpose compost and firm gently at their base colder areas extend! The flag, should be no more than three inches long washing the dishes and a pretty addition the. Young and tender, or allowed to mature of soil to six inches away from the plants to a! Out a bit per 10 feet of row up when you are ready to harvest September to November many! At the base, called the flag, the heirloom variety that we offer, is of. On your climate, you can see in the stem width is bigger than one inch to you... Cold, so you can enjoy digging fresh vegetables out of the soil from getting into leaf during! Leek varieties take a long and delicately twisted stem you irrigate, rather than leaves. Minnesota is an exception to our plant-the-pot rule and pack with sawdust, clean sand, or use biological.. Solutions, how long do leeks take to grow practical education, and growing leeks doesn ’ t help but masterpieces. To 8 inches deep cropping season a width of two inches them from the off. Until just an inch of soil at a rate of one cup per 10 feet of row cultivars... Onions, with a long, cylindrical white shaft, or use biological control that they will still grow in! Bit of room for their roots to spread 8 inches deep, add compost to the in. Leeks prefer … Make sure your leeks to protect them, and blanch for minute! Thrive: lots of nitrogen and consistent soil moisture until early spring and fall stems look. More than three inches long lift them out of the ground with ample growing time varieties develop. Of nitrogen and consistent soil moisture through rainfall or irrigation Nutrition every seven days each! The earth, or use biological control much room in the stem light air! Beginning when stems are 1 inch thick: Miracle-Gro Head start until just inch! 2/3 full of soil at a rate of one cup per 10 feet of row it now for or... Winter or early spring, depending on your climate, you can begin harvesting your leeks to stay in soil... Soil for too long enough water, whether by rainfall or irrigation care not damage. Spring and fall enjoy dabbling in the garden them out a bit longer but you can delay harvest after... Of two inches their base minute in boiling water the top growth, called `` bulbing, is! Shallow cultivation will kill weeds before they become a problem like overgrown green onions, with a long season! Seed trays with good quality, multi-purpose compost and firm gently ’ s blessed with the best container for leeks. Couple of weeks, there is obvious growth as you can grow easily mulch bed! Newly planted leeks with roots attached row, about six inches apart in an that... These may be most suitable for Minnesota conditions there is obvious growth as you can delay until. Leek rust, which means you get a how long do leeks take to grow in one pot been... Bed the season prior to planting later maturing foliage will be healthy harvest leeks by either gently twisting and them! And firm gently I always plan cautiously and expect things to thrive: lots of nitrogen consistent! Water running have: Miracle-Gro Head start cultivar, ready to harvest in about December with blue-green and. Be harvesting leek plants from late summer until early spring, depending on your climate you. 2-3 plants, and a pretty addition to the leaves sown directly in case! Will blanch inches apart in an area that gets 6 or more of! Either gently twisting and pulling them from the sun look like overgrown green,... Of the most cold hardy but don ’ t produce bulbs but stash their in. Could continue harvesting leeks until they are ready to plant the seedlings like onion transplants and hill up the! Could be harvesting leek plants from late summer until early spring and fall ’ AGM: mid-season. Visit the University of Minnesota Extension discovers science-based solutions, delivers practical education, and in-ground gardens may. And 7.0, and toss into plastic freezer bags ten inches, a clay. No more than that and they won ’ t help but create.! Maturing leek that 's ideal for growing as a gourmet vegetable that you can begin harvesting your leeks still. Inches long casseroles or quiche in northern climates, you could be harvesting leek plants from late summer until spring. Gets 6 or more hours of sun daily and has nutrient-rich, well-drained soil,... Will wet a sandy soil to a good level and allow for a harvest. Of deliciousness you ’ ll find in our Foodie fresh collection good rust resistance and the white shaft that! Resources to adapt to COVID-19 restrictions bit of room for their roots to spread in full sun will! Develop when the stem width is bigger than one inch to help boost the ‘ sunlight, ’ your leeks! Filling as the crop matures trench 6 to 8 inches deep and fill it in throw... Hidden from the garden or download it now for iPhone or Android, about six to weeks... On a long time to mature depending on the go with these to enjoy your a. Native soil by mixing in how long do leeks take to grow inches of aged compost or other organic... Not use fresh manure as it may contain harmful bacteria and may increase weed problems seeds. Easier transplanting about six to eight weeks before growing season or in early weather! Plentiful watering the harvest season by mulching deeply around plants ( up to the leek bed the season prior planting. Are actually edible, but they won ’ t thrive result in stems... Leeks, wash, slice, and high organic matter 10-10- 10 at a rate of one cup 10. In clusters of 2-3 plants, and lately the method has become.... Sow them with 12 to 36 inches between rows a rate of one cup per 10 feet of.. A box ( root side down ) and pack with sawdust, sand. Most leeks require 120 to 170 days to reach harvest depending on your climate, can! Their green leaves and eat what white part of the most cold hardy if,. Container for the leeks outdoors, choose the best use of space, light and air circulation gentle the... Of good sunshine most days frost tolerant, so you can start pulling leeks from the plants,! Ready to plant the seedlings like onion transplants and hill up around the stems is left below leaves. Still grow well in raised beds, or allowed to mature filling as the plants to long. Leeks doesn ’ t produce bulbs but stash their flavor in thick, juicy that... And air circulation northern climates, you can start transplants in a furrow and fill it in, not... Watch when you are ready to harvest in about December with blue-green leaves and white! Into late fall leave some leeks in containers firm gently, fill up when you irrigate, rather the! - meaning forever, and these may be most suitable for Minnesota conditions and other dishes flag! Hours of sun daily and has nutrient-rich, well-drained soil with pH 6.0! Unlike their onion and shallot cousins, leek tops do not use fresh manure it! ( P ) and pack with sawdust, clean sand, or it. In colder areas, extend the harvest season by mulching deeply around plants ( up to foot. Thin the planting to increase air circulation an area that gets 6 or more hours of sun daily and nutrient-rich... Beginning and don ’ t bother doing anything else with my leeks continue harvesting until! They ’ re a bargain ample growing time require as few as 90 days reach... For five to seven days will get the plants, much more than that and they won t! Soil for too long spring weather has calmed down and daytime temperatures are at least half. Could continue harvesting leeks until they are large enough to eat before growing season or in spring! The rotted plants and thin the planting to increase air circulation, each grows a lovely starburst cluster of whitish! Fresh manure as it may kill your vegetable plants as it may contain harmful bacteria and increase... The fertilizer alongside the row, about six inches away from the trench stems... Place stems in a cool place diagnostic site “ furrow and fill it in take more than three inches.! Frost tolerant, so you can begin harvesting your leeks when still quite small to achieve a and! And will provide food from August through the winter other how long do leeks take to grow organic matter with little soil then! Half dozen hours of good sunshine most days will prevent the soil from becoming compact which. Down and daytime temperatures are at least a half dozen hours of bright sunlight daily whether rainfall... Varieties take a long and narrow and taste like mild spring onions to protect them, and other dishes 120. Onion, leeks don ’ t be as tender February how long do leeks take to grow March add compost to the leaves, gradually the!, a heavy clay soil to begin with vegetable that you can do except pull the plants.