|Can I grow them in Chicago? Zone 3-6 I think? If yes, any tips?|
|The most commonly grown perennial vegetables in Illinois are asparagus and rhubarb. Asparagus should be planted as soon as the ground can be worked in the spring. Choose a sunny garden site and plant the crowns in an upright position six inches deep in a 12 to 18-inch-wide trenches that are spaced 9 to 12 inches apart and covered with two inches of soil.
The asparagus spears should be harvested when five to eight inches long from the third year after planting for a short period of time. But, in the fourth year and thereafter, spears can be harvested through June.