Leeks
Leeks are related to onions, but do not develop a bulb. Leeks look like overgrown green onions, with a long, cylindrical white shaft. The leaves are thick, flat and folded. Plants grow two to three feet tall, and can have a width of two inches. Leeks require a much longer growing season than onions, making it more challenging for them to grow to peak quality and maturity in Kansas. Leeks require a long, cool growing season, which means that in most cases, choosing fast-maturing varieties will be best. For spring-planted leeks, look for varieties that are early maturing and heat tolerant. For leeks planted in the late summer to fall, look for varieties that are early maturing and cold tolerant. Fall-planted leeks that will be overwintered for a spring crop can be later maturing and should be selected for overwintering quality and bolt-resistance.
How to Grow
In most cases, leeks are transplanted rather than direct-seeded. Leek transplants can be difficult to find, which means you may need to grow your own transplants. Leek seeds should be started indoors about 10 to 12 weeks before the expected transplant date, with a goal of having plants that are between a pencil lead and pencil width in diameter before planting. Leeks for summer harvest should be transplanted in mid-March. Leeks for fall harvest should be transplanted in late July to early August.
Another strategy may be to direct seed the leeks in mid- to late March and thin the seedlings to the desired spacings as they grow, with the expectation of a fall crop. This may be more successful in some years than others.
Leek plants should be spaced 6 inches apart in rows 12 to 15 inches apart. For larger leeks, you may want to space the plants and rows further apart.
- Sunlight: These plants prefer full sun with at least 6 hours of daylight during the day. Provide morning sun if possible.
- Temperature: Leeks prefer cool weather. Try to provide shade during the heat of the summer for the best quality leeks.
- Watering: Leeks have a shallow root system and need regular watering and fertilizing for best results. Try to provide one inch to one and a half inches of moisture a week. Too much moisture can lead to fungal issues.
- Soil and Fertilization: Leeks grow best in well-drained soil with pH between 6.0 and 7.0, and high organic matter. 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. Spread the fertilizer alongside the row, about six inches away from the plants, and scratch it into the soil.
- Transplanting: Leeks require specialized care to develop the desired long white sheaths. Transplants should be planted 3 to 6 inches deep, provided the plants are tall enough to have the growing point above the soil line at that depth. One way to easily plant leek seedlings is to use a 1-inch diameter stick or dowel to make holes your desired depth, then drop the plants in. Do not fill in the holes but let the soil wash in over time. If you are not able to plant the seedlings deep enough, you can also hill up the leeks later in the growing season, again taking care not to bury the growing point, which will cause dirt to be stuck in between the layers of the sheath.
- Pests and Diseases: Leeks are relatively pest and disease free with most issues being solved by proper cultural practices. Allow plenty of air movement and avoid over watering to prevent most issues. Weed control is essential to reduce competition. Mulching with straw or leaves will help both minimize weed competition and keep the soil evenly moist.
Harvest and Storage
Leeks can be harvested and used at any stage of growth. The expected mature size will vary with growing conditions, spacing, and variety selected. Most leeks are mature between ¾ and 1½ inches in diameter. Summer leeks are typically smaller than fall or overwintering leeks.
Harvest with a garden fork to carefully loosen the roots while gently pulling on the top. Take care to avoid breaking the stalk by pulling too hard without loosening the roots sufficiently.
Trim the tops in a V shape, so the tougher outer leaves are short and the younger inner leaves are longer. Remove any dead, damaged or otherwise inedible outer layers, and trim the roots to about ¼ inch. Leeks can be stored in plastic bags in the refrigerator for as long as 2 to 3 months.
Recipes
They have a mild onion flavor. You may eat them in soups, as well as raw, braised or in casseroles or quiche. You can eat both the green leaves and the white shaft.
Salmon Leek Frittata
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Recipe source: Food Network
Mashed Potatoes with Leeks
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Recipe source: Food Network
Pasta with Bacon and Leeks
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Recipe source: Food Network