August in the PNW Garden: Harvest Hard, Plant Fall
August is the month where the garden asks everything of you at once. You’re still picking beans and sweating over tomatoes, but blink and you’ll miss the window to get fall greens in the ground before the light starts bailing on you.
I’ve blinked. Multiple times. Here’s what I learned from those mistakes.
Harvest Like You Mean It
Tomatoes, peppers, beans, summer squash, early corn. Pick them. All of them. Pick them before they think they’re done. Leaving an overripe zucchini on the vine tells the plant its job is finished, and it will slow down fruit production faster than you’d expect. Ethylene gas, which ripening fruit produces, actually signals the plant to start winding down. Which is cool science and also deeply annoying when you want more zucchini.
Beans especially. The second a bean pod dries out and starts to look papery, that plant thinks it’s done reproducing and it kind of is. Keep picking and you keep the plant producing. It’s a negotiation. Pick your side.
Garlic should already be out of the ground and hanging somewhere dry and airy. If yours got pulled in late July, give it at least three to four weeks of curing before you braid it or bring it inside. The outer wrapper needs to be fully papery, not just close. Patience. (The cheapest thing in this garden is not my patience, unfortunately.)
Blueberries are finishing up or just finished depending on your variety. Pick the last of them, then make a note of which bushes gave you the most and which ones kind of coasted. August is when you actually remember this stuff. January you will have completely forgotten.
The Fall Garden Window Is Right Now
This is where August earns its weird reputation. You’re harvesting summer stuff with one hand and planting fall stuff with the other and somehow both feel urgent. They are both urgent.
Kale, chard, spinach, and lettuce started now will be ready for fall harvest before the heavy rains turn everything to mud. Direct sow or start in trays, doesn’t matter much, but get them going. Soil temperature here in Redmond in August is usually still warm enough that germination is fast, often under a week for lettuce. Lettuce germinates best around 60 to 65 degrees, and once soil temps push above 75 it gets flaky about sprouting. August mornings are still friendly. Use them.
Fall radishes are almost insultingly easy. A packet of daikon or a storage radish like watermelon radish goes in now and pays off by October. Direct sow, thin to about four inches, done. My daughters have started treating radish harvests like a lottery scratch-off, which, honestly, same.
Late August is also your cover crop window for any beds you’re clearing out. Winter rye or a clover mix sown now will establish before the rains hit and start doing the real work, feeding soil microbes, preventing compaction, keeping weeds from moving in. The mycorrhizal networks in healthy soil actually help cover crop roots establish faster. One of those things I find genuinely fascinating, then immediately stop thinking about because I need to find my seed bags.
Cheap cover crop seed is widely available at feed stores and garden centers in bulk. Sky Nursery usually has it. McLendon’s too. Don’t pay nursery packet prices for this. You need a pound, not a foil pouch.
Plan Now So October-You Doesn’t Panic
Garlic goes in October here. So August is when you figure out where it’s going, order seed garlic if you’re trying something new, and set aside any heads you want to save from this year’s harvest for replanting. Softneck varieties store longer, hardneck varieties taste more interesting. I grow both and refuse to commit to an opinion.
If you have plants finishing up and going to seed, now is also prime time for seed saving. Tomatoes need fermentation to remove the germination-inhibiting gel coat around each seed, so don’t just smear them on a paper towel and call it done. Let them sit in a little water for two to three days first. I learned this the hard way after a whole winter of zero germination and no idea what I’d done wrong. Turns out I’d done several things wrong.
Anyway. August is a two-shift day. Morning harvest, afternoon planting, evening planning. It’s a lot. But the alternative is a bare, weedy garden by September and a garlic-less spring, and I’ve been there too.
Lettuce get moving. (I’m not sorry.)
Photo by fr0ggy5 on Unsplash
