The Best Week of the Year for Growing Tomatoes in the Pacific Northwest
- Jackie
- 7 hours ago
- 11 min read
Growing tomatoes in the Pacific Northwest starts in late May. The soil has held above 60 degrees for a couple of weeks now, the nights have stopped dipping into the low 40s, and the plants that have been waiting on windowsills and in greenhouses are ready for their real home. Tomatoes are the crop most people in Seattle ask me about, and they are also the crop most people plant wrong. So this week the tomato section gets the most space. After that, a few other things need your attention too. This guide walks through six areas, organized the way a working kitchen garden actually runs.
Veggies and Herbs: Growing Tomatoes in the Pacific Northwest That Actually Produce
Get the tomato planting right and the rest of the summer is mostly watering and harvesting. Get it wrong in late May and you spend July wondering why the plant looks fine but there is no fruit. Here is what matters.
Plant them deep. This is the single most important thing and the one most people skip. Tomato stems grow roots anywhere they touch soil. Strip the lower leaves off the bottom half of the plant and bury that whole stem, so only the top cluster of leaves sits above the ground. A leggy, stretched-out start is not a problem for a tomato. Buried deep, that long stem becomes a large root system, and a large root system is what feeds a heavy crop.
Container, planter, or open soil. All three work in the PNW, and the difference is mostly about water and warmth. A large container or fabric grow bag warms up faster than open ground, which tomatoes like, but it also dries out faster, so you water more often. A raised bed holds moisture more evenly and gives the roots more room. Open ground is fine if your soil drains well. Whatever you choose, tomatoes are hungry plants. I plant mine close together and feed them regularly through the season, and they do well that way. The mistake is not tight spacing. The mistake is tight spacing with no feeding. If you plant densely, commit to the compost and the regular feeding that goes with it.
Trellis from day one. A tomato that flops onto the soil is a tomato that gets disease and slug damage. Put the support in at planting time, not in July when the plant is already a tangle. Stakes, a cage, a string run up to an overhead support, all of these work. Pick one before you plant and put it in the ground first.
Water at the base, deep and steady. Tomatoes want consistent moisture at the roots. Water the soil, not the leaves, and water deeply rather than a little every day. Uneven watering, dry then soaked then dry, is what causes blossom end rot and split fruit. A thick mulch of straw or compost around the base holds moisture and evens things out.
Protect from rain. This is the PNW-specific part. Our late spring and early fall rain lands on tomato leaves and spreads blight, which is the disease that turns a healthy plant brown and ends the harvest early. A simple rain cover, a clear panel or a cloche over the top of the plant, keeps the leaves dry while leaving the sides open for air and pollinators. You do not need a full greenhouse. You need the rain off the foliage. If you are setting up a rain cover anyway, a barrel positioned to catch the runoff gives you free water for the dry stretch in July and August.
Growing tomatoes on a balcony. You do not need a yard. A balcony with six hours of sun grows tomatoes well. Use the largest container you can manage, at least five gallons, because small pots dry out too fast and the plant stays small with them. A determinate or bush variety stays compact and is easier to manage in a tight space than a sprawling indeterminate type. Set the pot against a wall that catches afternoon sun and holds warmth into the evening.
Pruning. If you are growing an indeterminate tomato, the kind that keeps climbing all season, pinch out the small shoots that appear in the joint between the main stem and a side branch. Removing these side shoots keeps the plant putting energy into fruit instead of into more leaves. Determinate and bush types do not need this. They are meant to stay compact, so leave them be.
Fruit and Wild Fruit: Why I Grow Elderberry
If you have room for one more shrub in your garden this year, make it an elderberry. It is one of the plants I get the most quiet use out of, and it asks very little in return.
Here is what it gives back. In late spring the elderberry covers itself in wide, flat clusters of creamy flowers, and the scent on a warm day is wonderful. I harvest those flowers and turn them into elderberry flower syrup, which is one of the nicest things to come out of my kitchen all year. Later in the season the flowers become dark berries, and those I cook down into elderberry juice and jam. So one shrub gives you two separate harvests months apart, flowers in late spring and fruit in late summer.
The bees love it. When the elderberry is in bloom it is one of the busiest plants in the garden, and that is good for everything growing near it. It also earns its keep as structure. An elderberry grows into a dense, leafy screen, so it works as a natural fence or a shade plant along a property line, somewhere you want a bit of green privacy without putting up a wall.
The one honest catch is size. Elderberry wants to grow tall, and left alone it will get bigger than most people expect. That is not a real problem, because it takes pruning well. Cut it back hard in late winter while it is dormant and it comes back strong, and you can keep it to whatever height suits your space. The prunings are not waste either. Elderberry propagates very easily from hardwood cuttings, so a single shrub can become several over a few seasons, for your own garden or to pass on to a neighbor.
None of this is medical advice. Elderberry flowers and berries have a long traditional use in the kitchen, but the raw berries and other parts of the plant are not for eating uncooked, so the fruit always gets cooked before it goes into juice or jam. Anyone with specific health conditions, who is pregnant, or who takes regular medication should check with a doctor before adding elderberry to a routine.
For the rest of the berries, late May is steady-state. Blueberries that got their acidic feed and acidic mulch earlier in spring need nothing more right now except consistent water as the fruit sizes up. The same goes for gooseberries, currants, and raspberries. The feeding work was the spring job. The late-May job is water and patience.
Flowers and Trees: Direct-Sown Flowers Catch Up Fast
The sunflowers that went in by seed earlier in May should be up now. Late May is still a good window to sow more, along with other warm-season flowers like zinnias, cosmos, and nasturtiums. Direct-sown flowers establish a strong root system quickly and catch up to nursery starts within a few weeks, the same way cucumbers do. Choose a spot with at least six hours of sun, push the seeds in, water well, and keep the slugs off the seedlings for the first two weeks.
Nasturtiums earn their place in a kitchen garden specifically. The leaves and flowers are edible, with a peppery taste that works in a summer salad, and the plants ask for almost nothing in return. Poor soil is fine. Rich soil actually gives you more leaves and fewer flowers, so plant them where you would not bother to plant a vegetable.
Animals, Critters, and Nature: A Garden Full of Birds
My backyard is loud right now, in the best way. The birds are everywhere this month, nesting, feeding, drinking, bathing, and singing from early morning on. Robins, juncos, Steller's jays, crows, hummingbirds, and more. A kitchen garden is not just a place that grows food for you. Done right, it is one of the few real pockets of habitat left in a city, and the birds find it fast.
This matters beyond the pleasure of it. Birds in the garden are working for you. They eat slugs, caterpillars, aphids, and beetles, which means a yard full of birds is a yard with less pest pressure. Supporting them is not separate from growing food. It is part of the same system.
Giving birds what they need in a city garden comes down to four simple things, and none of them takes much.
Water is the easiest and the most used. A shallow dish or a proper bird bath, kept clean and topped up, gets visited constantly in dry weather, for drinking and for bathing. Keep the water shallow and add a stone or two so smaller birds have a safe place to stand. Refresh it every couple of days so it stays clean.
Food comes mostly from the garden itself. The elderberry and the sunflowers in the earlier sections of this guide are bird food as much as they are yours. Seed heads left standing into fall feed juncos and finches through the lean months. A garden that is a little less tidy, with some seed heads and some leaf litter left in place, feeds more birds than a perfectly groomed one.
Shelter is structure. Shrubs, a hedge, a small tree, the elderberry again, give birds somewhere to nest, to hide from cats and hawks, and to shelter from weather. Dense planting along a fence line does double duty as privacy for you and cover for them.
And then leave them be. If you find a nest in a shrub or a hedge this month, hold off on pruning that plant until the young birds have fledged. Keep cats indoors or supervised during nesting season if you can. Skip the chemicals, which is already the rule in this kind of garden, because a poisoned slug or beetle does not stop being poison when a robin eats it.
The hummingbirds deserve their own line. They are drawn to tubular flowers, so things like fuchsia, salvia, and flowering currant pull them in (my hummingbirds love the Pineapple Sage). A hummingbird feeder works too, with a simple sugar-water mix and no red dye, kept clean and refilled often, especially in warm weather.
None of this competes with growing food. A garden built for birds is a garden with fewer pests, more pollination, and a lot more life in it. That is the quiet argument for a kitchen garden that I do not always say out loud. It feeds you, and it gives something back to the small wild things trying to make a living in the city alongside us.
Knowledge Base: Watering Is a System, Not a Chore
The single biggest shift between an overwhelming summer garden and a calm one is how you handle water. Most people water a little, by hand, every evening, and then feel tied to the garden and still end up with stressed plants. There is a better way, and late May is the right time to set it up, before the dry stretch arrives.
Water deeply and less often. A deep soak two or three times a week pulls roots down where the soil stays cool and moist. A light daily sprinkle keeps roots shallow and the plant dependent on you. Deep roots are what carry a plant through a hot, dry week.
Water the soil, not the leaves. Wet foliage in our climate invites disease, especially on tomatoes. A soaker hose or simple drip line laid along the base of the bed delivers water exactly where it is needed and takes the daily decision off your plate entirely. Put it on a basic timer and the most time-consuming garden task largely runs itself.
Mulch holds what you give it. A few inches of straw, compost, or shredded leaves on the soil surface slows evaporation, keeps roots cool, and means the water you apply lasts longer. Mulch and a soaker hose together do most of the work of a much bigger irrigation setup.
And catch the rain while you still can. This May has been on the dry side, running below a normal Seattle May, which is exactly the reason not to count on the rain to keep coming. Whenever it does rain, a barrel under a downspout, or positioned to catch the runoff from a tomato rain cover, stores that water for July and August, when the city water bill climbs and the garden needs the most. It is a small piece of infrastructure that pays back every summer.
The point of all of this is not the equipment. It is that watering should be a system you set up once, not a daily chore you carry. A garden you have to rescue every evening is a garden you will eventually stop tending.
Service: Two Ways to See a Real Kitchen Garden This Spring
Most people have never stood in a working kitchen garden in their own climate. Magazine photos are not the same thing, and they tend to make the whole idea look unreachable. Standing in a real one changes that. There are two chances to do exactly that this spring.
The next (free) Garden Tour is on Saturday, May 23. It is a walk through my actual working kitchen garden in Phinney Ridge, every bed, in real life, with room for as many questions as you want to ask. The garden looks completely different in May than it does in April, with the tomatoes in, the beds full, and the summer crops underway. It is the easiest way to see what a PNW kitchen garden actually looks and feels like.
The Herb Garden Workshop is on Saturday, June 13. It is a small, hands-on session, and you leave with a planted herb garden in your hands, the actual containers with herbs already in the soil, not a worksheet and a page of notes. Herbs are the first thing I plant with every client, because they are the easiest starting point for anyone who cooks, and this workshop is the shortcut past the part where people mean to start and never quite do.
If either one sounds useful, find the booking details below. And if you are working through your own tomatoes or planning where a new shrub like elderberry should go this month and would rather talk it through one to one, Palatino Garden Adventures offers consultations for Seattle-area kitchen gardeners.
Book the Garden Tour, Saturday May 23: Walk My Garden With Me
Book the Herb Garden Workshop, Saturday June 13: A year-around Herb Garden Workshop
Closing
Late May sets the rhythm for the whole summer. Tomatoes planted deep, trellised early, watered steadily, and kept out of the rain will produce for months with very little daily effort. The same goes for the rest of the garden. The work this week is mostly setup, and setup done well is what keeps July from turning into overwhelm. One step at a time, one plan at a time.
Happy late-spring gardening. Let me know if you need help.
Jackie
Palatino Garden Adventures
Grow With Me & Get Monthly Garden Tips:
May & June bookings are now open for both the Executive Blueprint and one-on-one consultation sessions.
→ The Blueprint is the full design phase - soil assessment, crop selection, succession plan, and layout - everything covered in this post, done for your specific space. Book here.
→ Consultation sessions are a good fit if you want to work through one piece of it yourself with guidance. Either way, the spring planting window sets the deadline, and spots fill before it arrives. Book here.
Comments