Step-by-Step Growing Guide
Parsnips are one of the slowest and most demanding root vegetables to germinate — fresh seed is essential, as viability drops sharply after one year. Sow thickly (seeds are light and often have low germination rates) at 1cm depth directly into deep, loose, stone-free soil with pH 6.0–7.0. Do not use compost or manure in the planting trench as it causes forked roots. Thin to 10–15cm spacing once seedlings are 5cm tall. Parsnips need deep soil — ideally 40–60cm of loose, loamy, unobstructed earth for straight roots. Keep soil evenly moist during the long germination period (14–28 days) — the seeds are notorious for rotting if too wet or drying out if too dry. Interplant with fast-germinating radishes as row markers. Side-dress with a low-nitrogen, high-potassium fertilizer mid-season. Leave roots in the ground until after several hard frosts — the cold converts starches to sugars, dramatically improving flavor.