A how-to for asparagus — the patient crop. Plant a permanent bed once, wait a couple of years, then cut fresh spears every spring for 15+ years. Part of the Garden & Greenhouse.
Because asparagus stays put for decades, choose the spot carefully — full sun, deep, rich, well-drained soil, off to the edge where it won't be tilled. Dig a trench 6–8 in deep, set crowns 12–18 in apart with roots fanned out, and backfill gradually as the spears grow. Mulch well; keep it weed-free for the long haul.
The hard part: do not harvest the first year or two. Let every spear leaf out into tall ferns — that foliage feeds the crown and builds the root reserves that drive decades of yield. Cut spears too soon and you starve the bed and stunt it for good.
| Stage | What happens |
|---|---|
| Year 1 · Feb–Mar | Plant crowns in the trench; let all spears fern out — no harvest. |
| Year 2 · spring | Let it establish; still don't harvest (or take just a few spears very lightly). |
| Year 3+ · spring | Harvest spears for ~2–4 weeks as they emerge, then stop and let the ferns grow. |
| Summer | Ferns grow tall and feed the crowns; keep watered and weeded — do not cut them. |
| Fall / winter | Ferns yellow and die back; cut them down, mulch, and let the bed rest until spring. |
Asparagus beetles chew spears and ferns — pick them off and keep the bed clean. Crown and root rot follow poor drainage, so never plant in soggy ground. Removing dead ferns each winter cuts down on overwintering pests and disease.
Weeds are the long-term enemy of a permanent bed — mulch heavily and stay on them. The biggest mistake is harvesting too long or too early: stop cutting once spears thin to pencil width, and always let the ferns rebuild the crown.
| Step | How & how to keep |
|---|---|
| Cut | From year 3, snap or cut spears at ground level when 6–9 in tall and tight-tipped; harvest every 1–2 days through the spring window. |
| Stop in time | End the harvest after ~2–4 weeks (when spears thin out), then let everything fern up to feed the crowns. |
| Store | Stand cut spears upright in a little water in the fridge; eat within a few days. Blanch and freeze any surplus. |