When should I plant garlic?

Plant in the fall, about 4 to 6 weeks before the ground freezes.

How do I know when to harvest?

Harvest when the lower leaves begin to turn brown and dry out.

Plant guide

Garlic.

Allium sativum

Pronounced AL-ee-um sa-TEE-vum

Also known as Cultivated Garlic, Garlic

Garlic is a hardy bulbous perennial that is a staple in kitchens everywhere. It grows best in well draining soil and requires a period of cold to form its signature bulbs. You will love how easy it is to grow your own flavorful harvest.

At a glance

Care level: Easy
Plant type: Herbaceous perennial
Light: Full sun
Indoor light: direct
Water: Every 5 to 10 days
Mature size: 60 cm tall
Growth rate: medium
Hardiness: USDA 4 to 9
Bloom time: Late spring to early summer

Care

Plant cloves in the fall and keep the soil consistently moist but not soggy. Watch for yellowing leaves as the harvest time approaches, which signals that the bulbs are ready to be lifted. Ensure the soil has excellent drainage to prevent the bulbs from rotting during winter.

Watering: Keep the soil evenly moist throughout the growing season but reduce watering as the leaves begin to brown.
Feeding: Apply a balanced organic fertilizer once in early spring to support leaf growth.
Pruning: Remove flower scapes as they appear to direct energy into bulb development.
Repotting: Garlic is typically grown in the ground, but if using containers, refresh the soil annually before planting new cloves.
Soil: Well draining, fertile, loamy soil
Soil pH: 6.0 to 7.0
Temperature: -15 to 30°C
Humidity: 40 to 60%
Drought tolerance: moderate
Lifespan: Perennial, typically grown as an annual crop.
Fragrance: strong
Deer and rabbits: high

Signs it needs repotting

Roots growing out of the drainage holes.
Bulbs becoming crowded and pushing against the container walls.

Safety

People: Garlic is generally safe for humans, though raw consumption can irritate the stomach lining.
Pets: Garlic is toxic to cats and dogs as it can cause damage to their red blood cells.
Children: Keep bulbs away from small children as they pose a choking hazard if swallowed whole.
Contact allergens: Handling raw garlic can cause contact dermatitis in sensitive individuals due to diallyl disulfide.
Airborne allergens: Garlic pollen is not a common airborne allergen, but dust from dried bulbs can occasionally irritate the nose.
Edibility: While garlic is a common culinary staple, consuming excessive amounts can cause digestive distress or interact with certain medications.

How to identify it

Long, narrow, flat green leaves
Underground bulb composed of multiple cloves
Papery white or purple outer skin
Tall, central flowering stalk
Small white or pinkish star flowers

Height: 0.3 to 0.6m
Spread: 0.15 to 0.2m
Leaves: green, deciduous
Flowers: white, pink, 1 to 2cm
Fruit: white, purple, Summer

Common problems

White rot — A soilborne fungus that causes leaves to yellow and roots to decay.
Onion maggot — Larvae that tunnel into the bulb and cause the plant to wilt.

Growing it

Propagation: division
When to plant: Fall
Overwintering: Mulch the soil heavily after planting in the fall to protect the bulbs from extreme temperature fluctuations. Ensure the soil remains well drained to prevent rot during wet winter months.
In containers: Garlic grows well in containers at least 8 inches deep with good drainage.

Bulb division

Separate the bulb into individual cloves.
Plant each clove pointed end up in well draining soil.
Space cloves 4 to 6 inches apart.

Plant garlic in the fall alongside overwintering crops to maximize space and pest protection.

Grows well with

Carrots — Garlic helps deter carrot rust flies.
Roses — Garlic planted near roses may help repel aphids.

Keep away from

Asparagus — Garlic can stunt the growth of asparagus when planted in close proximity.
Beans — Garlic can inhibit the growth of beans by suppressing beneficial soil bacteria.

Similar species

Elephant Garlic — It is a larger, milder relative that grows in a similar fashion.
Chives — They share the same genus and have similar growing requirements.

Science

Family: Amaryllidaceae
Genus: Allium
Order: Asparagales
Class: Liliopsida
Native range: Central Asia and northeastern Iran.
Conservation: Garlic is a widely cultivated crop and is not of conservation concern.

It survives in the wild by producing hardy bulbs that remain dormant through cold winters.

Value to wildlife: nectar source
Pollinators: bees, butterflies
Uses: culinary flavoring, companion planting, traditional medicine

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 5/9
Moisture: 5/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

When should I plant garlic?: Plant in the fall, about 4 to 6 weeks before the ground freezes.
How do I know when to harvest?: Harvest when the lower leaves begin to turn brown and dry out.

Where the name comes from

The name Allium is the classical Latin word for garlic, while sativum means cultivated.

Good to know

Garlic is a member of the Amaryllidaceae family.
The pungent smell comes from sulfur compounds released when the bulb is crushed.
Garlic was once used by ancient athletes to improve performance.

Is your garlic looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.