Peanut
Arachis hypogaea
Flowers above ground, then drives a peg down into the soil where the nut actually forms.

How pegging works
After a flower is pollinated above ground, the stalk behind it elongates downward and pushes into the soil, and the pod develops underground at its tip. This means loose, light soil is not a preference but a requirement - pegs cannot penetrate a crust or heavy clay, and no pegs means no peanuts.
Soil above all
Sandy or sandy-loam soil, deeply loosened, low in clay. On heavier ground, grow them in a raised bed amended heavily with sand and compost. Avoid high-nitrogen fertiliser; like other legumes they fix their own.
Long season, warm start
They need 120 to 150 frost-free days, which makes them marginal but workable in zone 6b/7. Plant shelled raw seed after last frost once soil is warm, one to two inches deep. Choose shorter-season Spanish or Valencia types over Virginia types here.
Hill lightly at flowering
When the plants start flowering, mound loose soil or sand gently around the base to give the pegs somewhere easy to enter. Keep the area free of weeds and never let a crust form - light cultivation and a sandy mulch both help.
Calcium matters
Pods take up calcium directly from the soil around them rather than through the roots. Gypsum applied at flowering improves pod fill noticeably, especially on sandy ground. Empty pods ("pops") usually mean a calcium shortage.
Water, then dry off
Steady moisture through flowering and pegging. Ease off in the final few weeks before harvest so the pods mature and the plants can be lifted cleanly.
Pests
Mostly untroubled above ground. The real risks are voles and mice taking pods underground, and squirrels once they work out what is there. Leaf spot can defoliate plants late in the season.
Harvest and curing
Lift the whole plant with a fork when the leaves yellow and inner pod shells show darkened veining - dig one plant to check rather than guessing. Shake off soil, then hang or rack the whole plants somewhere dry and airy for two to three weeks until the pods rattle. Strip, then cure the pods another week before storing. Properly dried peanuts keep for months; underdried ones mould, and mouldy peanuts can carry aflatoxin, so discard any that look or smell off.
- Days to harvest
- 120-150
- Spacing
- 6-8 in
- Row spacing
- 30 in
- Soil
- Light, sandy, loose
- pH
- 5.8-6.2
- Sun
- Full
- Sow
- After last frost
- Cure
- 2-3 weeks