Asparagus is a long-lived perennial crop, capable of producing spring spears for fifteen to twenty years from a well-prepared bed. It deserves a permanent position away from cultivation, with deep, free-draining soil and thorough weed control before planting, as young crowns establish slowly.

When and how to sow

Plant one-year-old crowns in spring, once soil is workable, in a sunny, weed-free site. Dig a trench 20 cm deep and form a low ridge along its base. Set crowns 45 cm apart with roots spread evenly over the ridge, then cover lightly and fill the trench gradually as shoots grow. Allow 1.2 m between rows and enrich the bed beforehand with garden compost.

Care

Keep young plants watered in dry periods and remove weeds by hand, taking care not to disturb crowns. Apply garden compost each spring and after the cutting season. Do not harvest in either of the first two years. Let all later ferny growth stand until autumn, when it has yellowed naturally.

Common problems

Asparagus beetle is the principal pest, chewing spears and leaving dark eggs on stems. Hand-pick beetles, larvae and eggs whenever seen, and clear old fern growth in autumn. Rust and crown rot are encouraged by poor airflow or wet ground, so choose free-draining soil and avoid overcrowding.

Harvest

From the third spring, cut firm spears when their tips are still tight and they reach about 18 cm tall. Use a sharp knife at soil level, or snap cleanly by hand. Stop harvesting by midsummer, even if shoots continue, then allow the ferns to feed the crowns for next year.

Growing Asparagus: frequently asked questions

When should I sow asparagus in the UK?

Plant one-year-old crowns in spring, once soil is workable, in a sunny, weed-free site.

What are common problems when growing asparagus?

Asparagus beetle is the principal pest, chewing spears and leaving dark eggs on stems.

When is asparagus ready to harvest?

From the third spring, cut firm spears when their tips are still tight and they reach about 18 cm tall.

General guidance for UK home gardens and allotments. Reference figures are typical values; your exact timing depends on your region, last-frost date and variety. Page updated 18 Sep 2026.