In other words, don't harvest at all in the first two seasons, and harvest lightly the third. When the asparagus plants are in their fourth season, they may be harvested for eight to 10 weeks each year. Annual care Weed the bed each spring before the first shoots come up, to avoid accidentally breaking off spears. During the production period, it's best to pull weeds, rather than hoe them. Asparagus has fern-like foliage that makes a nice garden border.
Some gardeners prefer to support the growing foliage with stakes and strings to keep it tidy.
In all asparagus plantings, cut the foliage down to 2-inch stubs after frost, when the foliage yellows. A layer of 4 to 6 inches of mulch of compost, manure, leaves, or other material added at this time will help control weeds and add organic matter and nutrients.