10 Asparagus Plants Bare root Non GMO 2year old Asparagus Plants Asparaguses are perennial vegetables, so you just plant them once and enjoy season after season of succulent spears. Bare roots can be planted as soon as they arrive in spring. Rooted plants are great for fall and should be planted 4-6 weeks before first fall frost. In 2 years, you'll have a light crop and a regular crop thereafter. Long after harvest, the graceful, feathery green foliage is still attractive.