April Week 2: Plant Cool-Season Flowers and Veggies

The soil is cool, but the planting window is wide open.

Every year I watch gardeners make the same mistake: they wait for warm weather to start planting, then wonder why their lettuce bolted and their peas barely produced. Here’s the thing about April in the Pacific Northwest, it’s tentative at best, uncertain, and really not quite spring. There’s sunny days that tease you and cold snaps that make you doubt everything while scraping ice off your windshield. However, for a whole category of plants, these conditions aren’t marginal. They’re idyllic.

Cool-season crops evolved for exactly this moment: soil temperatures in the 40s and 50s, air that’s crisp but not freezing, long days with moderate light. They germinate faster, grow stronger, and taste better when planted now than they ever will in the warmth of June. The same goes for cool-season flowers, they don’t just tolerate cold, they thrive in it. That April window you think is too early is actually the sweet spot. Wait too long and you’ve missed it entirely.

Flowers to Plant Now

Pansies and violas are the workhorses of early spring color. Their cheerful faces shrug off frost, and they’ll bloom steadily until summer heat shuts them down. Plant them in beds, borders, or containers, they’re not fussy about location as long as drainage is decent. I tuck violas into my vegetable beds too; they attract early pollinators and look charming next to emerging lettuce.

Sweet peas want to go in the ground as early as you can work the soil. They’re climbers, so give them something to climb like a trellis, some netting, even a few bamboo stakes lashed together. Soak the seeds overnight or score them before planting to speed germination. Sweet peas planted now will bloom in late May and June, filling the garden with that unmistakable fragrance. Wait until May to plant and you’ll get maybe half the bloom before summer heat ends the show.

Calendula is another cold-tolerant annual that most people plant too late. I seem to get calendula flowers 12 months out of the year! Direct-sow seeds now, or set out transplants if you can find them. The cheerful orange and yellow flowers attract beneficial insects and are edible, making them a great salad ingredient. Calendula often self-sows, so one spring planting can become an annual tradition without further effort.

Vegetables to Plant Now

Lettuce, spinach, and other salad greens are the obvious choices, and for good reason. They germinate in cool soil, grow quickly, and taste far better than anything you’ll harvest in summer heat. Direct-sow in rows or scatter seed in a block, I prefer the chaotic method. Succession-plant every two weeks through May for a continuous harvest. Once temperatures climb into the 70s consistently, these crops will bolt, so get them in the ground now while conditions favor them.

Peas (snap, snow, and shelling types) are legumes, which means they fix nitrogen and improve your soil while producing a crop. Like sweet peas, they need support, even the “bush” varieties benefit from short stakes or netting. Plant seeds directly in the ground as peas resent transplanting. 

Members of the brassicas family like broccoli, cabbage, kale, cauliflower are the heavy hitters of the cool-season vegetable garden. Transplants are easier than starting from seed this late, though you can direct-sow kale without trouble. These crops actually improve in flavor after a light frost, so don’t baby them. Give them rich soil, consistent water, and protection from cabbage moths (floating row cover works well), and they’ll carry you through spring and into early summer.

A Note on Soil Temperature

This matters more than air temperature for seeds and transplants. Cold soil stunts root development and slows germination even if the air feels pleasant. You can buy a soil thermometer for a few dollars. Most cool-season crops want soil at least 40°F for germination and grow best between 45°F and 65°F. If your soil is still in the upper 30s, wait another week. That being said, I have not lived anywhere in the PNW that experiences permafrost and I have not had issue guestimating soil temperatures. 

The opportunity cost of waiting is real. Every week you delay cool-season planting is a week of growth you won’t get back. The plants don’t care that you’re not quite feeling spring yet. They’re ready. Meet them where they are.