Asparagus is a perennial plant that is often found wild along roads and railways, says the University of Illinois Extension service. A well-placed asparagus bed will last many years when done properly. Leeks are similar to a green onion, growing long leafs with a white shaft. Both asparagus and leeks have a long growing period, requiring large amounts of space and planting at depth. Leeks require a full 120 to 150 days to mature, while asparagus crowns require placement in the ground as soon as the ground thaws.
Dig a large trench that is 12 to 18 inches wide and 6 inches deep, says the University of Illinois Extension service.
Place the asparagus crown into the trench with the crown bud facing up, spreading out the roots into the dirt, suggests the University of Illinois.
Cover the crown of the asparagus with 2 inches of soil, filling in the trench with dirt as the crown grows. The crown will rise as it grows. Roots will grow horizontally from the plant says the University of Illinois.
Apply a 10-10-10, 12-12-12 or 15-15-15 fertilizer to the asparagus in the spring at 2 pounds per 100 square feet during the first four years. In the fourth year, begin applying fertilizer in June, says the University of Illinois.
Transplant leek plants once 10- to 15-weeks-old, suggests the University of Minnesota Extension. Harden the plants for 5 to 7 days, placing them outside in a cold frame for longer periods each day.
Trim the root of the transplant to 1 inch before placing in the the soil at a depth that covers the roots, says the University of Minnesota Extension service.
Place the leek plants in rows, plants four inches apart, suggests the Clemson University Extension service.
Apply a half-strength 20-20-20 or 10-10-10 fertilizer to get the plants started, says the University of Minnesota Extension service, at a rate of one cup per 10 feet.
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