Transitioning From The Summer To Fall Garden

THE PRINTABLE LINK IS BELOW:

Starting Fall Seeds in August (and Why the Soil Comes First)

Garden shelf | Companion to the video and the [Fall Seed Starting printable]

The garden looks finished right now. The squash vines have gone leathery, the lettuce bolted back in June, and everything that is still alive is alive out of stubbornness. It is easy to look at all that and decide the season is over.

It is not over. This is the week the fall garden starts, and the mistake almost everyone makes is waiting until the weather actually feels like fall. By then the window has closed. Fall seeds have to go in while it is still miserable outside, which is exactly why so few people do it.

The math nobody puts on the seed packet

Here is the part that took me a few seasons to work out.

Count backward from your first average frost date. Then subtract the days to maturity printed on the packet. Then subtract another two weeks or so, because that maturity number was calculated for spring and summer, when the days are getting longer and the soil is warm. In fall you have the opposite: shortening days, cooling soil, everything slowing down. Plants take longer to do the same work. Some people call it the fall factor. Whatever you call it, if you skip it your math will be optimistic by about a fortnight.

Then subtract however long you want to keep harvesting. If you want six weeks of greens, you need to be six weeks ahead of the frost, not one day ahead of it.

Run that backward and you land in August. That is why we are doing this now, in the heat, with the sweat running into my eyes.

Your date will not match mine. I am in [zone], and my first frost usually lands around [date]. If you are two zones north of me, you are already late, and I would sow something quick rather than nothing at all. If you are south of me you have more room than you think and can stagger a second sowing in a few weeks.

What is going in

[Fill in your varieties from the video]

I am starting most of these in trays rather than direct sowing, and that is not just habit. Lettuce and spinach germinate poorly in hot soil. Above roughly 80 degrees the seed will sit there and do nothing, and you will assume you got a bad packet when really you got a bad bed temperature. Starting them in trays somewhere shaded and cooler sidesteps the whole problem. Brassicas are less fussy about it, but I start those in trays too, mostly so I can protect the seedlings while they are small and stupid and every flea beetle in the county is looking for something tender.

The part everyone skips

Seeds are the fun half. The soil is the half that actually decides how this goes.

Think about what that bed has been doing since May. Tomatoes are heavy feeders. So are squash, so are peppers, so is corn. They have spent three months pulling nitrogen and everything else out of that soil and turning it into fruit that you then carried into the house. Nothing went back in. If you drop a fall transplant into that bed, it will sit there and sulk, and you will spend October wondering why your cabbage is the size of a tennis ball.

Feed the soil, and the soil feeds the plants. That is the whole thing. It is not complicated and it is not optional.

What I do: [compost and amendments you used, quantities if you measured them]

I will be honest that I do not soil test every bed every season. I probably should. What I go on instead is how the last crop performed and how the soil looks and feels when I turn it, which is less precise but it is what I actually have time for. If your beds are newer or you have never amended them, a test is worth the twenty dollars, because guessing works better once you have a few seasons of watching the same ground.

One more thing about the transition itself. Be ruthless about what comes out. A tomato plant that is limping along producing four sad fruits a week is occupying real estate that a fall crop could use for six productive weeks. I know it feels wasteful to pull something still technically alive. Pull it anyway. The calendar is not going to wait for that plant to finish having its feelings.

What will probably go wrong

Watering. August seed trays dry out fast, and if they dry out once during germination you are starting over. I check twice a day in this heat, morning and evening, and I still lose a few cells.

Flea beetles will find your brassica seedlings. They will not usually kill an established plant but they will absolutely shred a two-inch one. Row cover from the day they go out is the easiest answer.

And some of this will just not come up. That is normal, it is not a referendum on you, and it is why I sow more cells than I need. If you have never done a fall garden before and half of it fails, you still have half a fall garden, which is more than you had last year.

The printable:

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