June Gardening Tips and To-Dos for the Pacific Northwest

June is a good month in this garden. The foxgloves are tall, the roses are starting their first flush, and the cut flower beds are filling in faster every day. The rain starts tapering off, the days get genuinely long, and there’s this brief window when everything looks like it’s exactly where it should be.

There’s also a lot to do. June is a transition month for PNW gardeners, and the decisions you make now carry through the whole summer. These are my June tips and to-dos for Zone 8b, with notes on what to plant, what to maintain, and what to keep an eye on as the season shifts.

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Growing in the Pacific Northwest in June

June in the Pacific Northwest means we’re moving from wet to dry. The soil still holds plenty of moisture from the spring rains, but by mid-month, the rain becomes more sporadic, and the sun starts doing real work. Daytime temperatures climb into the 60s and 70s, nights stay cool, and the growing season hits its stride.

Our maritime climate is genuinely good for plants. The moderate temperatures, long days, and consistent moisture through spring mean things get established without the stress of heat and drought right out of the gate. The downside is that cool, damp conditions can invite fungal issues and slugs, both of which need managing this time of year.

All of these tips are based on zone 8b. If you’re unsure of your zone, the USDA Plant Hardiness Zone Map is the place to check.

What to Plant in the Garden in June

Vegetables

June is still a productive planting month for vegetables, especially in the first half. Mid-June is also when I start thinking about fall and winter crops, which sounds premature but really isn’t.

Transplant these summer crops as soon as possible if you haven’t already, waiting until night temperatures are consistently above 50°F and soil temperatures are above 60°F for heat-lovers like tomatoes and eggplant:

Direct sow these into the ground:

For herbs, June is a great time to get fennel, dill, chives, cilantro, basil, parsley, mint, oregano, and marjoram in the ground or in containers. Basil loves the warming soil temperatures of early summer.

If a fall vegetable garden is on your list, start seeds for brassicas like broccoli, cabbage, and kale toward the end of June and into early July, so transplants are ready when August arrives.

Flowers: Perennials

Local nurseries usually have a good selection of perennial plants through June. The key with June planting is to get them in early enough that they have time to establish before summer heat settles in, and to water consistently for the first few weeks. Good choices for June planting include daylilies, coneflowers, black-eyed Susans, Shasta daisies, lavender, Russian sage, and astilbe.

These are all forgiving plants that establish well without a lot of fuss, as long as you water them in properly and keep them from drying out those first few weeks.

Flowers: Annuals

June is not too late for annuals, especially fast-maturing varieties. Cosmos, zinnias, sunflowers, nasturtiums, marigolds, calendula, petunias, creeping zinnia, and coneflower all do well with a June start. They establish quickly in the warming soil and will be blooming by midsummer.

Annuals are what I lean on in June when the perennial beds have a gap between the spring bloomers finishing and the summer ones taking over. A few containers of petunias or geraniums on the greenhouse steps fill that in instantly.

Wildflowers

Ideally, wildflower seeds go in during fall or early spring when cool, moist conditions favor germination. If you missed that window, June is worth a try with varieties known for quick germination, like cornflower, California poppy, bachelor’s buttons, and annual lupine.

Keep them watered until they’re established and manage expectations a bit. They may bloom later in the season than a spring sowing would.

June Garden Maintenance

Watering

As rain becomes less reliable through the month, irrigation becomes more of an active task. June is when I run each zone of the irrigation system manually to check for leaks, clogged heads, or anything that didn’t survive the winter. Better to find problems now than in August.

General targets for June watering: about an inch per week for flowers and shrubs, and deeper, less frequent watering for newly planted trees and shrubs (every week or two until fall rains return). Reduce watering for early potatoes as the plants start to die back. Soaker hoses and drip irrigation are the most efficient for flower beds, getting water to the roots without wetting the foliage, which helps prevent fungal issues.

Change birdbath water regularly. It warms up quickly in June, and the water becomes stagnant quickly.

Pincing Annuals and Cut Flowers

If you grow cut flowers, June pinching is one of the highest-return tasks of the season. Pinching the central stem of young plants encourages branching, which means more stems and more blooms later. Cosmos, zinnias, dahlias, sweet peas, and snapdragons all benefit. Do it when plants have a few sets of true leaves and before they’re too far along.

For container annuals like fuchsias and geraniums, pinch back any leggy or spent growth to keep plants full and producing. It feels a little ruthless, but the plants rebound fast.

Pruning and Deadheading

June is a busy pruning month. A few specific tasks worth putting on the list:

Spring Bulb Cleanup

By June, tulip and daffodil foliage should be browning and starting to pull free easily. Once it does, remove it. Don’t rush this: the leaves are still feeding the bulb right up until they go fully yellow and limp. Dig up any bulbs that performed poorly this season and either replace them or assess whether the spot is working for them.

Worth knowing: most tulips and hyacinths only perform well for two to three years before declining. If yours are looking tired, they probably are.

Divide daffodil clusters that have gotten crowded. Smaller, congested clumps bloom less. Dividing them every few years keeps them flowering well.

Dividing Perennials

You can still divide perennials that aren’t in active bloom. Primroses, for example, are good candidates after they finish flowering in late spring. Division gives you more plants for other spots in the garden and is generally good for the long-term health of crowded clumps.

Water divisions in well and give them some shade for a few days if the weather is warm.

Fertilizing

June is a good month for a targeted feeding pass through the garden. A few specific things I do:

Weeds and Pest Control

Pull weeds the moment you see them, before they flower and set seed. If you’re short on time, at least snap off the flower head so they can’t spread. Weeds that go to seed in June create problems for years.

Slugs are in full force this month. I use Sluggo around dahlias, hostas, zinnias, and marigolds, which are especially susceptible. It’s pet and wildlife-safe, which matters with Jax and Ollie in the garden. Reapply after rain. There are also more natural approaches if you prefer: copper tape barriers, crushed eggshells, or hand-picking at dusk (one of my favorite methods).

For roses, watch for black spot and remove any affected leaves as soon as you spot them. Spray with insecticidal soap for aphids, mites, and thrips if populations are getting ahead of you.

Caterpillars on edible plants: hand-pick or drop them in soapy water, or toss them where birds can find them. Planting flowers that attract beneficial insects nearby is one of the better long-term pest management strategies.

Inspect plants regularly on your daily walk. Catching problems early keeps them from becoming full-scale issues.

Walk the Garden Every Day

This is the simplest advice I can give and the one that makes the most difference. A ten-minute walk through the garden each morning, iced latte in hand, is worth more than an hour of catch-up work at the end of the week. You’ll catch pest problems early, notice when something needs water, deadhead a few things while you’re there, and generally stay ahead of the garden instead of running behind it.

Keep a notebook or use your phone to jot down what you see. What performed well, what didn’t, what you want to do differently next year. June observations are gold by the time January seed catalogs arrive.

Greenhouse and Potting Shed

June is a natural time to clear out the greenhouse if you haven’t already. Most of the seedlings are out in the garden by now, and the greenhouse has a quieter few months ahead before fall cuttings and winter growing begin.

Discard any dead or diseased material, clean and stack pots and containers, and wipe down surfaces. Clean pots reduce pest pressure significantly going into fall.

Common Questions About June Gardening in the Pacific Northwest

What Can I Plant in June in Western Washington?

Quite a lot, actually. For vegetables, June is the last good window for warm-season crops: tomatoes, peppers, cucumbers, squash, melons, corn, and eggplant should go in as soon as possible. Direct-sow beans, beets, carrots, chard, and pumpkins.

For flowers, annuals like zinnias, cosmos, sunflowers, and nasturtiums established quickly from a June start, and perennials like daylilies, coneflowers, and lavender can still be planted if you keep them well-watered while they settle in.

Is It Too Late to Plant Annuals in June in the PNW?

Not at all. Fast-maturing annuals do well from a June planting and will bloom by midsummer. Zinnias, marigolds, sunflowers, cosmos, and nasturtiums are all reliable choices. The warmer soil actually helps them establish more quickly than an early spring planting would.

Is June Too Late to Plant Wildflowers?

It’s past the ideal window, which is fall through early spring, but not hopeless.

Look for varieties with fast germination: cornflower, California poppy, bachelor’s buttons, and annual lupine are the best bets for a June sowing. Keep them watered, and they’ll likely bloom later in the season.

What Perennials Can I Plant in June in the Pacific Northwest?

Daylilies, coneflowers, black-eyed Susans, Shasta daisies, lavender, Russian sage, and astilbe are all solid choices for June planting.

The key is to water them deeply at planting and keep them consistently moist for the first few weeks while their roots establish. After all, most of these are self-sufficient.

When Should I Start Fall Vegetable Seeds in the PNW?

Late June into early July is the window for starting brassicas like broccoli, cabbage, kale, and cauliflower for fall harvest. Starting indoors or in a shaded cold frame gives you more control. Transplant them out in late July or early August, and they’ll be ready to harvest before the hard frosts of November.

How Do I Manage Slugs in a PNW Garden?

Consistently, because they don’t give up. I used Sluggo around susceptible plants like dahlias, hostas, and zinnias. It’s iron phosphate-based, which makes it safe around pets and wildlife. Reapply after rain.

Other approaches: copper tape around containers, hand-picking at dusk when slugs are active, or reducing hiding places they love, such as dense ground cover or debris near vulnerable plants.

One Last Thought

June can feel like the garden is getting ahead of you if you try to do everything at once. It’s not. Break it into daily walks and small tasks, and it stays manageable. The garden this time of year genuinely wants to grow. Your main job is to support that and stay out of the way.

If you’re in Zone 8b and have questions about timing or specific plants, drop them in the comments. I’m happy to share what has worked and what hasn’t.

Until next time,

Happy Gardening!

I’m a self-taught hobby gardener. Everything I share on my blog is my opinion and what worked for me.