Good morning gardeners!
April heralds a bright beginning to the gardening season in Portland. As I write the sunshine has poked out behind the clouds and I think we may see a nice spring day unfold. If you did not plant any vegetables or herbs in March, you did not miss out and you are not too late. I, myself, held off on planting any vegetables or herbs until April. March weather is super unpredictable and still a chance of frost. When soil and air temperatures are cold, seeds are slow to germinate and small plants are slow to grow.
Our average last frost date in Portland is around March 15-March 31. Historically, our average last frost date was April 15 and I think we will be close to that this year. I see in the forecast that we are expecting frost tonight and tomorrow morning April 3. This cooler weather means we are still planting cool season vegetable crops throughout the entire month of April.
Here's what to plant now and the preferred planting method-seeds vs. starts:
Asian greens-seeds or starts
Beets-great time to plant seeds in April
Brussels sprouts (plant in spring for a fall harvest)-I recommend starts
Carrots-great time to plant seeds in April
Collards-seeds or starts
Florence Fennel-seeds or starts
Kale-seeds or starts
Lettuce-seeds or starts
Mustard Greens-seeds or starts
Parsnips (plant now for a fall harvest)-seeds
Peas-don't like heat so get them in by the end of April-seeds or starts
Radicchio-seeds or starts
Salad greens-arugula, cress, endive, escarole, mache, purslane-seeds
Scallions-seeds or starts
Spinach-seeds or starts
Swiss Chard-seeds or starts
April is the perfect month for planting potatoes from certified seed potatoes.
Continue planting artichoke and rhubarb plants, horseradish from roots, and sunchokes from tubers. February and March are the ideal time for planting asparagus crowns, though you could still try planting in April.
Allium family-plant leeks from seeds or starts, onions from sets or bunches, garlic from cloves or starts.
Runner beans are the only type of bean that can be planted early and will tolerate light or dappled shade. Plant some seeds now in April, like scarlet or sunset runner. They make beautiful ornamental plants grown up a trellis as a vine hummingbirds will love. Harvest the pods while very young and small for fresh green beans. Or wait until pods are large and dry out for shelling/dry beans.
Herbs-plant cool season annual herbs like cilantro and chervil. Plant all perennial herbs now. Plant hardier annual herbs like dill and german chamomile. Wait on tender warm-season annual herbs like basil and shiso until May.
Fruit-keep planting strawberries, blueberries, raspberries, and fruit trees through April.
WAIT until mid to late May when night temperatures are consistently above 55 degrees to plant warm season crops like: beans, celery, corn, cucumbers, eggplant, gourds, melons, peppers, pumpkins, summer squash, sweet potatoes, tomatoes, tomatillos, winter squash, and zucchini. Seriously, just wait until later in May. Planting now does not give you a "jump-start" it actually only risks stunting or outright killing these plants.
In April annual bedding plants become available at nurseries. Don't forget to interplant your veggie garden with annual flowers and herbs as companion plants for beneficial bugs. Some of my favorites: alyssum, calendula, cleome, cosmos, marigolds, nasturtium, and zinnia.
Mid-April is a great time to plant sunflower seeds directly into the garden. April is time to plant lily, gladiola, and liatris bulbs in the flower garden. Wait until May to plant dahlia tubers. April is when you will find the most excellent selection of perennial plants.
Remember to apply Sluggo organic slug bait all around your edible and ornamental garden. Reapply at 2 week intervals to keep slugs under control.
Thank you for reading my blog and I am happy to receive your gardening questions here in a comment. Please contact me at email@example.com if you are interested in scheduling an in-person or email edible gardening consultation. Happy gardening and happy April!