Parsnips are a patient gardener's crop: slow to germinate, long in the ground and exceptionally hardy. Their creamy roots develop a sweeter, fuller flavour after frost, making them ideal for autumn and winter meals. Deep, stone-free soil is the key to straight, well-shaped roots.

When and how to sow

Sow fresh seed direct from February to April, once soil is workable, as parsnip seed soon loses vigour. Prepare a deep, fine bed free of stones and freshly added manure. Sow several seeds at each station, 15 cm apart, then keep the surface moist while germination slowly takes place. Thin to the strongest seedling. Do not transplant parsnips, as roots will fork.

Care

Mark rows clearly and weed often, because seedlings are slow and easily overwhelmed. Water in prolonged dry weather to encourage even root growth, then mulch lightly to conserve moisture. Avoid excessive feeding, which promotes leafy tops. Keep soil loose around the shoulders, taking care not to damage developing roots.

Common problems

Parsnip canker causes dark, sunken patches on roots, especially in stressed crops; use fresh ground, avoid damage and rotate roots annually. Carrot fly may attack nearby crops, so cover with fine mesh or fleece. Forking usually reflects stones, compaction or disturbed soil rather than pests.

Harvest

Begin lifting from October, after a frost has improved flavour, using a fork well away from the root to prevent breakage. Leave sound roots in the ground through winter and lift as needed, provided soil is not frozen solid. Remove foliage before storing any lifted roots somewhere cool and damp.

Growing Parsnips: frequently asked questions

When should I sow parsnips in the UK?

Sow fresh seed direct from February to April, once soil is workable, as parsnip seed soon loses vigour.

What are common problems when growing parsnips?

Parsnip canker causes dark, sunken patches on roots, especially in stressed crops; use fresh ground, avoid damage and rotate roots annually.

When is parsnips ready to harvest?

Begin lifting from October, after a frost has improved flavour, using a fork well away from the root to prevent breakage.

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 19 Sep 2026.