Asparagus
Asparagus officinalis
Asparagus is a long-term investment that rewards patience with decades of spring harvests. Once established, a well-maintained bed will produce spears for 20 years or more. Plant one-year-old crowns in March or April into well-prepared trenches enriched with organic matter. The critical rule: don't harvest any spears in the first two years — let the ferny foliage grow unchecked to build up the crown's reserves. From year three, harvest spears from mid-April to mid-June by cutting them at soil level when they're about 15cm tall. After mid-June, stop harvesting and let all subsequent spears grow into ferns, which feed the crown for next year. 'Gijnlim' and 'Connover's Colossal' are reliable UK varieties. Asparagus needs a sunny, sheltered spot with well-drained soil. Feed with a general fertiliser after the harvest season ends.
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When to Sow Asparagus
Sow asparagus in March, April.
Time to Harvest Asparagus
Expect to harvest approximately 24 months after sowing.
Expected Yield
Established crowns produce 20–25 spears per season; around 500g per plant.
Growing Tips
Perennial that produces for up to 20 years
Common Problems with Asparagus
Asparagus beetle
Small black-and-yellow beetles and their dark grubs strip the ferny foliage in summer, weakening the crown for the following year's harvest. Pick off beetles and larvae by hand on sight, and cut down and burn (or bin) all old fern growth in autumn to destroy overwintering beetles. Keeping the bed weed-free removes hiding places.
Thin spears
Pencil-thin spears are almost always a sign that the crown is too young, underfed, or exhausted from over-harvesting. Never harvest any spears in the first two years after planting — let all growth develop into fern to build the crown's reserves. From year three, stop harvesting by mid-June. Feed annually with a general fertiliser after the harvest season ends.
Crown rot
The crown turns soft and mushy, often caused by waterlogged soil or planting in heavy clay. Asparagus demands excellent drainage — raised beds are ideal, especially on clay soils. Ensure the crown is planted on a mound of soil within the trench so water drains away from it rather than pooling around the roots.
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Daucus carota
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Lactuca sativa
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