When most people think of fall gardening, they picture pumpkins, mums, and autumn leaves – not garlic.
Yet, ask any seasoned gardener when the best time to plant garlic is, and the answer will almost always be the same: September.
Planting garlic in September may seem counterintuitive – after all, most crops are planted in spring. But garlic is different.
It thrives on being tucked into cool soil before winter, where it can quietly establish roots and get a head start for the following year.
By spring, while other gardeners are still sowing seeds, your garlic will already be growing strong.
Why September Is the Best Time to Plant Garlic
1. Garlic Needs a Cold Period to Thrive
Garlic (Allium sativum) requires a chilling period – called vernalization – to form large, plump bulbs. Planting in September allows the cloves to experience enough cold during winter, which triggers proper bulb development.
2. Root Development Before Winter
September soil is still warm enough for cloves to establish strong root systems before frost sets in. This root growth is crucial for supporting the plant during spring’s rapid leaf and bulb development.
3. Earlier and Bigger Harvests
Garlic planted in fall consistently produces larger bulbs and is ready to harvest earlier in summer compared to spring-planted garlic. September planting ensures you’ll beat the summer heat while enjoying healthier yields.
4. Less Competition From Weeds
Weeds germinate less aggressively in cooler months. By planting garlic in September, your cloves have fewer competitors for nutrients and sunlight.
5. Natural Pest & Disease Resistance
Cold-weather growth gives garlic a head start against pests like onion maggots, which are less active in fall and early spring.
Choosing the Right Garlic to Plant
Before you plant, it’s important to know which type of garlic works best for your garden.
Hardneck Garlic
- Ideal for northern climates with cold winters.
- Produces scapes (flower stalks) that can be harvested and eaten.
- Flavor: Bold and complex.
- Storage: Lasts 4–6 months.
Softneck Garlic
- Best for warmer climates with mild winters.
- Produces more cloves per bulb.
- Flavor: Mild to medium.
- Storage: Lasts up to 9–12 months.
Pro Tip: If you’re unsure, plant both varieties to see which thrives in your garden.
How to Plant Garlic in September: Step-by-Step
Step 1: Choose the Perfect Spot
- Select a location with full sun (6–8 hours daily).
- Garlic prefers loose, well-draining soil rich in organic matter.
Step 2: Prepare the Soil
- Work compost or aged manure into the soil at least 6–8 inches deep.
- Garlic thrives in soil with a pH of 6.0–7.5. Test and adjust if needed.
- Avoid soil where onions or garlic have grown in the past 2 years to reduce disease risk.
Step 3: Break the Bulbs
- Just before planting, break garlic bulbs into individual cloves.
- Choose the largest, healthiest cloves for planting.
- Leave the papery skins intact.
Step 4: Plant the Cloves
- Plant each clove pointy side up about 2 inches deep.
- Space cloves 4–6 inches apart in rows 12 inches apart.
Step 5: Water and Mulch
- Water thoroughly after planting.
- Apply a thick layer of mulch (straw, shredded leaves, or hay) to insulate cloves and suppress weeds.
Garlic Care Through the Seasons (Month-by-Month Guide)
September – Planting Time
- Prepare soil and plant garlic cloves.
- Water deeply to help establish roots.
- Add mulch for insulation.
October – Root Establishment
- Garlic develops roots under the soil surface.
- Keep mulch in place.
- Water only if the weather is very dry.
November – Winter Prep
- In colder regions, add an extra layer of mulch as temperatures drop.
- Plants may sprout small green shoots, which is normal.
December to February – Dormancy
- Garlic rests beneath the soil while roots continue growing slowly.
- Little care is needed; just ensure mulch remains intact.
March – Spring Growth Begins
- Shoots emerge as temperatures warm.
- Remove some mulch to allow soil to warm.
- Water lightly if the soil is dry.
April – Vigorous Leaf Growth
- Fertilize with a nitrogen-rich source (fish emulsion or compost tea).
- Keep weeds under control.
May – Scape Season (Hardneck Garlic Only)
- Cut scapes when they curl for tender, flavorful cooking.
- Removing scapes encourages bigger bulb growth.
June – Bulb Development
- Water consistently, about 1 inch per week.
- Stop fertilizing to encourage bulb maturation.
July – Harvest Time
- Garlic is ready when the lower 2–3 leaves turn yellow but the upper leaves remain green.
- Gently dig up bulbs with a garden fork.
August – Curing & Storage
- Cure bulbs in a shaded, airy place for 2–3 weeks.
- Trim roots and stalks, then store in a cool, dry spot.
And then, September comes again… and the cycle repeats!
Common Garlic Planting Mistakes to Avoid
- Planting Too Shallow: Leads to weak bulbs and winter damage.
- Using Grocery Store Garlic: Often treated to prevent sprouting and may carry disease. Always use seed garlic.
- Skipping Mulch: Exposes cloves to cold damage and weed competition.
- Overwatering: Garlic hates soggy soil and can rot if overwatered.
- Planting Small Cloves: Yields small bulbs; always select the biggest cloves.
Benefits of Planting Garlic in September
- Bigger Bulbs: Fall-planted garlic consistently outperforms spring garlic.
- Earlier Harvests: Enjoy garlic when others are just starting.
- Self-Sufficiency: Garlic is one of the easiest crops to save and replant year after year.
- Low Maintenance: Once planted, garlic requires minimal care until spring.
- Natural Pest Control: Garlic helps deter pests in companion planting (like aphids and carrot flies).
Garlic as a Companion Plant
Garlic isn’t just useful for cooking – it’s also a natural companion plant that benefits other crops.
- Protects Tomatoes: Repels spider mites and aphids.
- Supports Fruit Trees: Helps deter borers and beetles.
- Helps Roses: Reduces black spot and aphid infestations.
- Boosts Carrots and Beets: Repels carrot flies and leaf miners.
Planting garlic in September means it will be ready to support these crops during the next growing season.
Every September, as the days shorten and the air cools, I head into the garden with my seed garlic.
Planting at this time has never failed me – the bulbs are always bigger, the harvest earlier, and the plants healthier.
Garlic is one of those crops that rewards patience. While it sleeps beneath the soil all winter, it’s preparing for a strong burst of growth in spring.
And when I finally harvest those fat, aromatic bulbs in July, I always remember why I plant in September—and why I’ll never regret it.
