Peanuts grow best in light, sandy loam soil with generous amounts of compost and manure and good drainage. They will not thrive in clay soils. They require five months of warm weather, with temperature of about 20-30 Celsius degrees (68-86 F) and humidity of 80%. A frost-free place is essential. You can also cultivate peanuts in your greenhouse, in well prepared beds, at a temperature of above 20 Celsius degrees (68 F), reducing humidity at flowering time to aid pollination.
The pods ripen after 120-150 days after the seeds are planted. If the crop is harvested too early, the pods will be unripe. If they are harvested late, the pods will snap off at the stalk, and will remain in the soil. You will recognize the maturity of the peanut when its foliage has turned yellow. You can harvest them by taking the whole plant out. After harvesting, wait 2 to 4 weeks to dry the peanuts. After the peanuts have dried, store them in a cool and dry place until they are ready to be consumed.
Grow your own peanuts by sowing seeds indoor, removed from their shells, in spring or outside in situ when the soil temperature exceed 16 Celsius degrees (61 F). When the seedlings are 10-15 cm tall, harden them off and transplant them to well-prepared beds in your garden or in your greenhouse, depending on the area where you live. Space the plants 25-30 cm apart and 60-70 cm between the rows. Offer them extra protection if necessary by covering them with cloches or polytunnels.
Make sure to provide water to keep the soil moist, specially in dry periods, as sandy soils dry out quickly, but do not overwater them. For best results keep their place weed-free, hoe regularly and avoid watering the plants during the flowering period. Apply rich compost or fertilizers to enrich the soil. Do not disturb the plants after the pollination is finished.