How to Grow Parsnips in the UK

How to Grow Parsnips in the UK: Complete Growing Guide

Parsnips are a quintessentially British winter vegetable — sweet, nutty, and transformed by frost into one of the most flavoursome roots in the kitchen garden. They require patience (germination is slow) and deep, well-prepared soil, but the reward is a crop that stands in the ground all winter and improves with every cold snap.

Soil Preparation

Parsnips need deep, stone-free, well-drained soil to produce long, straight roots without forking.

• Dig deeply: Dig or fork the soil to at least 30 cm (12 inches) depth — ideally 45 cm for long varieties
• Remove stones: Stones cause roots to fork and split; remove as many as possible
• Do not add fresh manure: Fresh manure causes forking. Manure the bed the previous autumn and allow it to break down
• pH level: Neutral to slightly alkaline (pH 6.5–7.0)
• Avoid compaction: Work from a plank to avoid compacting the soil before sowing

How to Sow Parsnips

Parsnips must be direct-sown — they cannot be transplanted as the taproot is damaged by root disturbance.

• Sow date: Mid-March to May once soil reaches 7°C
• Sowing depth: 1.5 cm (half an inch)
• Station sowing: Sow 3 seeds per station, 10–15 cm apart, in rows 30 cm apart
• Thin seedlings: Once germinated, thin to the strongest seedling per station
• Use fresh seed: Parsnip seed loses viability quickly — always use seed from the current year
• Keep moist: Water gently and regularly until germination — this can take 14–28 days

Ongoing Care

• Watering: Water in dry spells, especially during germination and early growth. Established plants are fairly drought-tolerant
• Weeding: Keep weed-free, especially when young. Parsnips are slow to establish and easily swamped
• Thinning: Thin to one plant per station once seedlings are large enough to handle
• No feeding needed: Parsnips in well-prepared soil need no additional feeding
• Earthing up: Not required, but a light mulch helps retain moisture in dry summers

Common Problems

Parsnip canker: Orange-brown rot at the shoulder of the root. The most common parsnip problem. Choose resistant varieties (Javelin F1, Gladiator F1), avoid root damage when thinning, and improve drainage.

Carrot fly: Larvae tunnel into roots. Cover with fine insect mesh from sowing to harvest. Sow after late May to avoid the first generation of flies.

Poor germination: Almost always caused by old seed or cold soil. Use fresh seed every year and wait until soil reaches 7°C before sowing.

Forked roots: Caused by stones, fresh manure, or compacted soil. Prepare the bed deeply and remove all stones before sowing.

Harvesting Parsnips

• When: From October onwards, once foliage begins to die back
• After frost: Flavour improves dramatically after the first frost — wait until November or December for the sweetest roots
• How: Loosen soil with a fork before lifting to avoid snapping the root
• Leave in ground: Parsnips can stand all winter and be lifted as needed — no need to harvest all at once
• Final harvest: Lift all remaining roots by March before new growth begins

Storage

• In the ground: Best left in the ground until needed — they store perfectly in situ through winter
• Refrigerator: Store lifted roots in the fridge for up to 2 weeks
• Cool store: Pack in boxes of slightly damp sand in a cool, frost-free shed for up to 3 months

Recommended Varieties

• Tender and True: Long, smooth roots, excellent flavour, good canker resistance. AGM variety
• Javelin F1: Outstanding canker resistance, smooth uniform roots, good for heavier soils
• Gladiator F1: Shorter, bulkier roots for shallow or stony soils. AGM winner
• The Student: Victorian heritage variety, superb flavour, needs deep well-prepared soil
• Countess F1: Compact roots, good canker resistance, reliable germination