Ideally suited to the northern climate and are best harvested after a hard frost or in early spring. Winters-over well. Similar to growing carrots. One packet = 2 g. = 360 seeds, sows 25 feet. 1 oz. = 3750-7500 seeds. CULTURE: Sow 12 seeds per foot, 1/4 inch deep in rows 18-24 inches apart. SEASON: Cool season. Plant as soon as ground can be worked in the spring. MIN. SOIL TEMP: 35 degrees Fahrenheit. GERMINATION: 3 weeks. SOIL: Slightly acid pH 6.0-6.8. PESTS: APHIDS: Control with beneficial insects or soap sprays. PARSNIP WEBWORM: Problem for seed production. Remove affected flowers and spray crop with pyrethrum mixed with Bt.