Garlic Allium sativum
Reviewed June 2026 · how we check this
A hardy, long-season bulb crop planted in fall and harvested the following summer. Garlic asks almost nothing through winter, then rewards you with fat, fragrant heads of cloves. One of the most forgiving and storable things you can grow, and a true plant-once, harvest-big staple of the kitchen garden.
Light
Garlic is a sun-lover and needs full sun — at least 6 to 8 hours of direct light a day — to size up big heads. Pick the brightest, most open spot in the garden, away from the shade of fences, walls, or tall summer crops. In too little light, plants put their energy into thin, floppy leaves and produce small, disappointing bulbs that store poorly. Because garlic grows through the cool shoulder seasons, low winter sun is rarely the issue; the spring sunshine after the soil warms is when the foliage races up and powers bulb formation, so don't let leafy neighbors crowd it then.Watering
Garlic wants steady, even moisture through its active spring growth — about 1 inch of water a week from rain or hose, enough to keep the top several inches of soil consistently damp but never waterlogged. Soggy soil rots the developing bulbs, so plant in well-draining ground and water deeply rather than often. After fall planting, water in the cloves once and let the rains and snow take over through winter. The critical step is to stop watering two to three weeks before harvest, once the lower leaves begin to brown — dry soil at the end cures the wrapper skins and keeps the heads from molding in storage.Soil & potting
Garlic thrives in loose, fertile, well-draining soil rich in organic matter, with a slightly acidic to neutral pH around 6.0 to 7.0. Before planting, work in a couple of inches of finished compost or aged manure and loosen the bed deeply so the bulbs have room to swell. Heavy clay that stays wet invites rot and produces small, misshapen heads — lighten it with compost and coarse grit, or build a raised bed. Plant cloves pointy-end up, about 2 inches deep and 6 inches apart, then mulch with straw to insulate roots over winter and suppress spring weeds.Humidity & temperature
Garlic is fully cold-hardy and actually needs a cold period (vernalization) to split into proper cloves, which is why it's planted in fall. Cloves overwinter happily in frozen ground, hardy down to around 0°F (-18°C) under a straw mulch, and shrug off frost that would flatten tender crops. It does its bulking in cool-to-mild spring weather between 40 and 75°F (4–24°C), then matures as summer heat arrives. A few weeks of genuine winter chill below 40°F is what triggers good bulb formation, so spring-planted garlic in warm climates often yields a single round instead of a cloved head.Fertilizing
Garlic is a hungry crop with a long season, so feed it generously. Mix a balanced granular fertilizer or rich compost into the bed at planting time. The big push comes in early spring when the leaves resume growth — side-dress with a nitrogen-rich feed (such as blood meal or a liquid fish or all-purpose fertilizer) every three to four weeks to fuel lush foliage, since each leaf corresponds to a wrapper layer on the future bulb. Taper off nitrogen by late spring as the bulbs begin to size up; too much late feeding pushes leaves at the expense of the head and can soften the wrappers for storage.Pruning & maintenance
Garlic needs little pruning, but hardneck varieties send up a curling flower stalk called a scape in early summer — snap or cut these off once they curl, both to redirect energy into the bulb and to enjoy them as a mild, delicious vegetable. Harvest the whole plant when the lower third to half of the leaves have yellowed and dried but several green leaves remain up top, usually mid-to-late summer. Loosen the soil with a fork and lift gently rather than yanking. Don't wash the heads; brush off loose dirt and cure them, tops and roots attached, in a dry, airy, shaded spot for two to four weeks.Propagation
Garlic is grown not from seed but by planting individual cloves, each of which becomes a whole new head — so propagation is simply replanting your best cloves. In fall, a few weeks before the ground freezes, break a firm head into separate cloves, leaving the papery skins on, and plant only the largest outer cloves pointy-end up; bigger cloves make bigger bulbs. Save seed garlic from your healthiest heads each year and it adapts to your garden over time. Avoid planting grocery-store garlic, which may be treated to resist sprouting or carry disease — start with certified seed stock.Common problems
Through the year
Spring
The big growth season. Leaves surge up — side-dress with nitrogen, keep the bed weed-free, water to 1 inch a week, and snap off hardneck scapes as they curl.
Summer
Bulbs finish sizing and mature. Stop watering as lower leaves brown, then harvest when a few green leaves remain and cure the heads in a dry, airy spot.
Fall
Planting season. Break heads into cloves and plant the biggest ones pointy-end up in enriched soil, water once, and mulch heavily with straw for winter.
Winter
Dormant and untroubled under mulch. The required cold spell triggers clove formation — no watering or feeding needed; just leave the bed be.
Companion planting
Garlic is a classic good neighbor — its pungency helps deter aphids and other pests, so it pairs well with carrots, lettuce, broccoli, and kale. Keep it away from peas and beans, whose growth garlic can stunt.
Recommended supplies for Garlic
Affiliate links — we may earn a small commission at no cost to you.
You might also like
Go deeper
The complete Vegetable Gardening care library
Every species in one printable, organized reference — side-by-side care, a pet-toxicity table, and a seasonal calendar.