What to Start from Seed in June (PNW)

June in the Pacific Northwest is the gardening equivalent of finally getting the green light after sitting at a red for eight months. The soil is warm enough that I’m not just gambling anymore. I planted beans in mid-May one year, they sat there for two weeks doing absolutely nothing, and I’m pretty sure they were judging me.

The direct-sow window is wide open now. Here’s what I’m putting in the ground this month, what I’m skipping, and why. Let’s get into it.

Bush Beans: The Succession King

If there’s one thing June is screaming at you to do, it’s start bush beans. And then start more bush beans two to three weeks later. And then again. Bush beans are the crop that rewards you for being slightly obsessive about scheduling.

Germination really kicks in around 70 degrees, which is where soil temps are finally landing in most of the PNW right now. Plant them every two to three weeks through early July and you’ll get a steady harvest instead of the classic “200 beans on Tuesday, zero for the rest of the month” situation. I’ve lived that situation. It’s not great.

Pole Beans: Once Is Enough

Unlike bush beans, pole beans just need one sowing. They produce longer by nature, so succession isn’t really the play here. Get them in, get your trellis up, and let them do their thing. I built mine out of bamboo I found on clearance at Sky Nursery for something like $4.13. Works just as well as the fancy stuff.

Summer Squash and Cucumbers

Direct-sow both of these now without a second thought. Squash especially wants warm soil and doesn’t love having its roots messed with from a transplant anyway. Same deal with cucumbers. Straight in the ground, an inch deep, a little patience.

One nerdy thing worth knowing: cucumbers use transpiration to regulate internal temperature, which is why they actually stay cooler inside than the air around them. That’s the whole “cool as a cucumber” thing, and it’s real biology, not just a saying. Anyway. Plant them and move on.

Melons: Yes, But Use a Cloche

I know. Melons in the PNW sounds like a dare. But June is actually your shot, especially if you’re using a cloche or row cover to trap a little extra heat. Our seasons are long enough if you start now and cheat the temperature a bit. I use cheap wire hoops with clear plastic sheeting I reuse every year. Not pretty, but it works.

Melons need that warmth to trigger proper vine growth. Without the soil heat, they just sulk. The cloche buys you the degree-days you’d otherwise lose to June clouds.

Corn: Plant in a Block, Not a Row

My youngest asked to grow corn this year. We do not have a lot of space. We now have corn. This is just what happens when you garden with kids.

The key thing with corn is pollination. Corn is wind-pollinated, and if you plant it in a single row, the pollen just blows right past the silks. Plant in a block, at least four rows wide, and you get a legitimate pollen cloud working in your favor. That’s not gardening advice, that’s fluid dynamics. One-time sowing only, mid-June at the latest here in the PNW.

Succession Lettuce in the Shade

Lettuce is complicated in June because it starts to bolt when temperatures climb. The trick is finding a spot that gets afternoon shade. The north side of a taller plant, under a row cover, somewhere the heat breaks a little. Keep sowing every two to three weeks in those spots and you can stretch the season well into summer.

Lettuce triggers bolting partly through a phytochrome response to day length, not just heat, which is why shade helps but doesn’t fully solve the problem. Still, shade buys you time. And time is free, which is my favorite price.

Carrots and Beets

Late June carrots and beets are actually a great play for fall harvest. Direct sow both, keep the seed bed moist (carrot germination stalls fast if the top dries out), and you’ll be pulling them in September and October when most people have given up on the garden.

I use a piece of burlap laid over the carrot row for the first week to hold moisture. Wet it down once a day, lift it the moment you see sprouts poking through. I learned this the hard way after losing two whole rows to dry soil right when they were about to germinate. Painful. Don’t repeat my mistakes.

Basil: Finally

Basil is the crop I’ve been waiting on. It’s cold-sensitive enough that May is always a gamble here, but June is the real deal. Soil temps above 60 degrees, nights staying mild, basil goes outside now. Direct sow or transplant, either works. Just don’t crowd it. It needs airflow or it gets angry and fungal, and that’s a bad combination.

What NOT to Start in June

Tomatoes, peppers, and eggplant from seed right now? Skip it. There’s not enough season left for them to develop from seed to fruit before our fall arrives. If you missed the indoor start window, just buy transplants. I know, it costs a little more. But starting tomatoes from seed in June in the PNW is an exercise in optimism that the calendar simply won’t reward.

Same goes for broccoli, cauliflower, and cabbage for spring harvest. Those needed to go in much earlier. You can start them indoors now for a fall planting, but that’s a different article.

Also, don’t bother with spinach outdoors this month. It bolts fast in June heat and you’ll just be frustrated. Wait until late August and you’ll be much happier. Spinach has thyme on its side later in the season. (Sorry. Couldn’t help it.)

The Short Version

June is the month where the garden rewards the people who actually show up. Get beans in succession, use a cloche on the melons, plant corn in a block, find shade for your lettuce, and don’t waste seeds on tomatoes from scratch. That’s really it.

The soil is finally warm. Get some beans in the ground before you overthink it.

Photo by fr0ggy5 on Unsplash