|'All American' keeps very well both in the ground and after harvest. The flesh is particularly tender. The taste of parsnips is intensified by cold, because some of their starches turn to sugars. A hard winter will make for wonderfully sweet parsnips.
Parsnips like deeply tilled, light soil with a pH of about 6.5. Acidic soil will encourage cankerous roots. Germination can be slow, taking up to 3 weeks, but can be improved if you warm the soil with a plastic cover. Sow seed 1/2 inch deep in rows 1 foot apart. If parsnips are watered after a long dry spell, the roots may split, so water them regularly. Harvest the crop from mid-autumn through the winter.