Garlic Planting Prep for the PNW: September Setup

I put off garlic planting prep for two years because I figured garlic was garlic and the ground was the ground and how hard could it be. Planted it in spring both times. Got sad, marble-sized bulbs that my daughters politely described as “baby garlic” like that was a compliment.

Turns out fall planting isn’t just a preference. It’s basically the whole game.

Why October Planting Starts in September

Garlic needs cold vernalization to trigger proper bulb development. That long chilly exposure is what tells the plant to split into cloves instead of staying as one solid round. The cold basically flips a biological switch, and if you miss the window or plant in spring, that switch never gets flipped right. Which explains my marble collection from 2021.

So you plant in October, yes. But you prep the bed now, in September, so the soil has a few weeks to settle and the amendments actually integrate before the cloves go in. Rushed soil prep is not really soil prep. Ask me how I know.

Hardneck vs. Softneck: Pick Your Fighter

Here in the PNW, where our winters get legitimately cold, hardneck varieties are the move. They handle the cold better, tend to produce bigger individual cloves (fewer per head, but who’s complaining), and they send up scapes in June. Scapes are the curly flower stalks that you cut off to redirect energy to the bulb, and also they’re delicious sautéed in butter, which is reason enough to grow hardneck on its own.

Softneck is what you see braided at farmers markets. Longer shelf life, more cloves per bulb, but smaller ones. No scapes. And softneck gets sulky in hard freezes, which, depending on your spot, can be a real issue west of the Cascades some winters.

My personal pick for this area: Musik or German Red for hardneck. If you want a softneck for long storage, Silverskin works fine. But honestly, I’d just grow hardneck and eat whatever doesn’t make it to spring.

Where to Get Seed Garlic Without Paying Nursery Prices

Grocery store garlic is a trap. It’s often treated to suppress sprouting (ethylene gas, fun fact) and sometimes carries disease. You can spend a whole season growing something that was never going to perform well from day one. A real clove-and-dagger situation.

The cheap and actually good options, in order of preference:

• Farmers market: Talk to the garlic vendors in late summer. Many sell seed garlic or will set aside good heads if you ask. This is also where you find local varieties that are already adapted to your exact conditions.
• Save from last year: If you grew any garlic this year, save the best heads for replanting. Biggest cloves from the biggest bulbs. That’s it. Free. I like free.
• Garlic festivals: Washington has a few scattered around. You’ll find variety selection that puts any nursery to shame, and prices are usually reasonable because you’re buying direct from growers.
• Online seed suppliers: Last resort, but reliable. Shipping costs sting and you lose the local adaptation advantage, but if you can’t find what you want locally, it’s better than nothing. Look for hardneck seed garlic from reputable seed companies.

Soil Prep: The Part That Actually Matters

Garlic wants loose, well-draining soil with a pH around 6.5 to 7. That range keeps the nutrients accessible and keeps the soil microbes happy, and happy microbes mean nutrients actually get to your plants instead of just sitting there being technically present.

Work in a solid 2 to 3 inches of finished compost to about 4 inches deep. Not fresh manure. Fresh manure can introduce pathogens and burn tender roots. Finished compost only. If you’re in doubt about your pH, a cheap soil test kit from the hardware store is worth the few bucks. Especially if you’ve been amending heavily with acidic materials like wood chips or pine mulch. I grabbed one at McLendon’s for something like $4.79 and it told me everything I needed to know.

After you’ve worked in the compost, rake it smooth and let it sit. The soil biology needs a little time to do its thing before you introduce the cloves. Two or three weeks is enough. Longer is fine.

One thing I did wrong the first time I actually got the variety and timing right: I planted into soil I’d just turned that same day. The structure was too loose, the cloves shifted around, and a few came up sideways in spring. They still grew, but the point is, do as I say, not as I do.

The October Handoff

Get the bed prepped now, source your seed garlic at the farmers market before the season ends, and you’re set up for an easy October planting. You’re basically doing the hard part while the weather is still pleasant enough to enjoy being outside. Which is a rarity in the PNW once October actually shows up.

Fall-planted garlic gets a long, slow head start underground before the hard freeze, builds a root system all winter, and explodes in spring when the soil warms. Spring-planted garlic is basically a tourist. It never quite gets there.

Anyway. Get your soil ready. September is not too early. It’s actually, annoyingly, exactly the right time.