Your August Garden Checklist: Harvesting Hard, Planting Smart, and Getting Ready for Fall
August is when the garden asks a ton of you, but it also gives so much back. The heat is relentless, and it seems like something needs to be harvested every single day. There’s also the fact that fall’s on the way and you need to start prepping for it. If you get the timing right this month, you’ll carry the momentum of the summer garden straight through to frost. Here’s what deserves your attention in the August garden.
Harvest Now and Don’t Stop
The most important thing you can do in August is keep harvesting. Many summer crops keep on going. As long as you keep picking, they keep producing. The moment you let a cucumber go yellow or a bean dry on the vine, you’ve sent a signal to the plant that its reproductive work is done, and production slows or stops.
Walk your rows every day if you can. Pick beans when they’re slender, pull cucumbers before they get yellow and huge, and cut your zucchini when they’re small enough to actually taste good.
Herbs need the same attention this month. Basil especially bolts fast in August heat. Pinch back flower buds the moment you see them and harvest hard. This is the month to make pesto and fill the freezer with herb cubes. Once basil flowers and sets seed, the leaves turn bitter, and production is over for the season.
The Tomato Situation
Late blight and fungal diseases make their move on tomatoes in August. If you’re watching the foliage brown from the bottom up or seeing dark, water-soaked lesions on stems and leaves, you’re dealing with blight.
Removal is your first step. Strip dead and dying leaves and bag them in the trash (not the compost pile because the spores can survive and overwinter). Improve airflow by removing lower foliage even on healthy plants and stop any overhead watering. Water at the base of the plant only.
If blight is advancing faster than your tomatoes are ripening, pick them green and let them ripen off the vine. A tomato that has reached full size and started to show any blush at the blossom end will ripen perfectly well on a counter or windowsill at room temperature. Don’t put them in the refrigerator, which kills texture and flavor. Just leave them stem-side down on the counter and check them daily.
Sowing Fall Vegetables
August is the month to start your fall garden, and you have more options than you might think. The key is counting backward from your first expected frost date. In the Middle Tennessee area around Franklin, the first frost is usually between mid-October and early November. That gives you roughly eight to 10 weeks from now.
You can direct-sow radishes (harvest in 25 to 30 days), turnips (45 to 60 days), arugula, spinach, leaf lettuce, kale, Swiss chard, and Asian greens like bok choy and tatsoi. They actually prefer the cooler temperatures of fall and taste better after a light frost, which converts some of their starches to sugars. Go with succession planting, and you’ll be harvesting well into November.
For broccoli, cabbage, cauliflower, and other cole crops, you’re better off starting transplants now rather than direct sowing, or getting starts from a garden center. They need up to 90 days to mature, so timing is tight. Get them in the ground by mid-August for the best chance at heads before hard frost arrives.
One more worth thinking about is a second round of green beans. If you’re at least 60 days out from your first frost, bush beans can still give you a fall crop.
Clear Out Spent Plants and Disease Residue
As summer crops finish, pull them promptly. A spent cucumber vine or a stripped bean plant left in the row can attract pests and breed disease. Squash vine borers overwinter in soil near their host plants. Fungal spores persist in dead foliage through the fall and spring, right back up next year. The cleaner you leave the bed, the less you’re setting yourself up to fight the same battles in the same spot.
Healthy plant material goes in the compost pile. Anything showing mold, blight, rot, or heavy pest damage goes in the trash or gets burned. The compost pile doesn’t get hot enough reliably to kill all pathogens, and diseased material in compost is one of the most common ways gardeners spread problems from one season to the next.
Don’t leave the soil bare. Either plant your fall crop immediately or cover the surface with a layer of compost and mulch. Bare soil loses moisture fast in August heat. It’s also an open invitation to weed seeds and loses structure to rain and foot traffic. A two-inch layer of straw or shredded leaves protects the soil until you’re ready to plant and can be worked in when you are.
Protect New Growth from the August Heat
Planting seeds and transplants into August soil can be frustrating but worth it. The soil surface temperature in full sun can reach well above your air temperature, which makes germination difficult and wilts transplants within hours.
Shade cloth draped over new seed rows or transplants cuts soil surface temperature, reduces moisture evaporation, and protects your seedlings from the scorching afternoon sun without blocking enough light to stunt growth. You can remove it once plants are established and the September temperatures start to moderate.
Mulch bare soil in new planting areas immediately after seeding. A light covering of straw over a seed row holds moisture in the soil and stops the hard crust that forms when bare soil alternately bakes and gets rained on.
Water new plantings consistently. In August heat, new seeds and transplants need moisture at the root zone without the soil staying soggy. Early morning is the best time to water because it gives the soil surface a chance to dry before the heat of the day.
What Else Is Worth Doing This Month?
- Save seeds from your best performers. If you’re growing open-pollinated or heirloom varieties, August is the time to let your best ones mature fully on the plant for seed saving.
- Stay on top of late-season weeds. Late summer weeds are running out of time, and they know it, so they go to seed faster than spring weeds, and a single pigweed plant left to mature in August can drop tens of thousands of seeds.
- Keep an eye on pests. Spider mites love hot, dry August conditions and will colonize stressed plants fast. Look for fine webbing and stippled, grayish foliage. Japanese beetles are also still active early in August.
What to Do with Everything Coming In
An August Garden produces faster than most families can eat fresh, which means August is also peak preservation season. Green beans can be blanched and frozen, or pressure canned for the shelf. Tomatoes can be water bath canned with added lemon juice, dehydrated into concentrated flavor bombs, or frozen whole for winter sauces. Cucumbers become pickles, and peppers can be frozen, dried, or pickled.
If you’re looking to learn any of these methods in depth, our Canning 101 Online Course is the place to start. It covers both water bath and pressure canning. You can browse everything available in the Stoney Creek Farm shop.
We’re also sharing what’s happening on the farm through August on YouTube and Facebook. Come find us there for more tips, ideas, and a look at what’s coming out of the garden this week.
