Asparagus is a delicious and resilient perennial that can be grown anywhere from kitchen gardens to roadside ditches and flowery meadows.
But be careful when scouting locations. Once established, this hardy plant will produce for 20 years or more.
Asparagus is considered something of a gourmet vegetable but it isn’t a crop for impatient gardeners, says Brenna Aegerter, a University of California farm adviser.
“To be on the safe side, you don’t want to over-harvest, so it’s good to wait at least two years after planting,” Aegerter said. “You don’t want to take them too early. You want those underground crowns [year-old root systems] to build up a carbohydrate reserve.”
Asparagus should be planted in sunny, well-drained sites in spring, using uniformly sized crowns set 18 inches apart and in rows some 5 feet apart. Wait until the threat of frost has passed.
Place crowns in the furrows and fill with about 2 inches of soil. Gradually boost the rows with soil as the plants continue their growth, or until the crowns are about 6 inches below the surface.
Each crown can produce about a half-pound of edible spears per year when fully established.
“Asparagus is very drought-tolerant and can usually grow without supplemental watering because it seeks moisture deep in the soil,” according to an Ohio State University fact sheet.
The optimal pH for asparagus is 6.5 to 7.5. Weed growing beds thoroughly, and fertilize with a 10-20-10 formulation before planting.
“You can’t completely neglect it but asparagus isn’t a high-maintenance plant,” Aegerter said. “It is susceptible to a few serious diseases, but for the most part doesn’t have high fertilizer needs.
Asparagus is a surprisingly large fern-like plant that can grow to heights approaching 5 feet in dedicated sites.
Weed control is the most challenging part of growing asparagus, said David Trinklein, a professor at the University of Missouri.