Tree · Cornaceae
Kousa Dogwood
Cornus kousa
A small tree that gives you star-shaped blooms, edible fruit, and peeling bark all year round.
Full sun
Every 5–10 days
USDA 5–8
15–30 ft · 4.6–9.1 m
Overview
What makes kousa dogwood such a keeper? It changes with every season. Late spring brings a big flush of pointed, star-shaped bracts, and here's the neat part: unlike the native flowering dogwood, it opens after the leaves are already out, so the blooms sit against a green backdrop. Then by late summer it's hung with pinkish-red fruit that the birds love and you can eat too.
It won't take over, either. It tops out around 15 to 30 feet (4.6 to 9.1 m) tall and roughly as wide, wearing a vase shape when it's young that fills out and rounds off with age. Since it's a slow grower, it never crowds a small yard. And as the trunk gets older, it peels off patches of bark to leave a mottled, camouflage pattern that keeps things interesting all winter.
Lots of gardeners plant it as a tougher stand-in for Cornus florida, and it's easy to see why. It shrugs off the anthracnose and borers that hammer the native dogwood, doesn't ask much once it's settled, and takes cold right down to -20°F (-29°C). Give it decent soil and steady water and it pretty much runs itself.
Care
The short version: full sun to part shade in rich, slightly acidic, well-drained soil, kept evenly moist through the heat of summer. Mulch the roots, hardly ever prune, and just let this slow grower settle in at its own pace.
Light
Kousa dogwood is happiest in full sun to part shade. Full sun gets you the most flowers, but if you're somewhere hot, a bit of afternoon shade keeps the leaves from scorching come midsummer.
Water
Keep the soil at a nice, steady, medium moisture, watering every 5 to 10 days and a bit more often when it's hot and dry so you head off leaf scorch. Once it's established it handles drought better than the native dogwood, but it never wants to sit in soggy, waterlogged ground.
Soil
Give it rich, humusy, well-drained loam that leans acidic to neutral, ideally a pH of 5.5 to 7.0. Mix in some compost and top it with an acidic organic mulch, and you'll keep those roots cool and fed.
Temperature
This is a tough one, hardy across a big range from -20°F to 95°F (-29°C to 35°C), which covers USDA zones 5 through 8. It takes hard winters just fine and only really struggles where summers stay brutally hot and dry.
Humidity
Regular outdoor humidity works great, so there's no number to chase here. What matters more is air movement, because crowded, stagnant growth is what lets powdery mildew creep onto the leaves.
Feeding
One feeding in early spring with a balanced slow-release fertilizer does the job, or you can just top-dress with acidic compost or mulch. It's a slow grower with modest needs, and it really doesn't want to be pushed.
Pruning
You can pretty much leave the pruners in the shed. Just take out dead, damaged, or crossing branches, and do it right after flowering in late spring to early summer so you're not lopping off next year's buds.
Repotting
You'll rarely keep a kousa dogwood in a pot for the long haul, so repotting hardly ever comes up. But if yours is potted and the roots start circling or poking out the drainage holes, bump it up to a bigger container or, better yet, get it in the ground.
Size & spacing
Plan on a mature tree around 15 to 30 feet (4.6 to 9.1 m) tall with a spread to match. Give it that much open room so the broad, rounded crown can fill out and air can move through the branches.
When to plant
Kousa dogwood is a woody tree you plant once and keep for decades, so there's no rush. Pop it in the ground in spring or fall so the roots can grab hold before the next round of heat or hard frost, and look for the bloom in late spring with edible fruit ripening from late summer into early fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: spring or fall
- Harvest: Blooms late spring to early summer (May to June), after leaves emerge; pinkish-red edible fruit ripens late summer to early fall.
Hardiness
USDA hardiness zones: 5–8
Temperature: down to -29°C
Troubleshooting
Almost all kousa dogwood trouble shows up on the leaves, and honestly it's usually the site or the weather to blame, not the tree. Once you can tell summer scorch from the two leaf-spotting fungi, you'll know whether to grab the hose or the rake. Match what you're seeing below, then jump on it before it spreads.
Crispy brown leaf edges once summer heats up
So what's going on there? That's leaf scorch, and it happens when a tree in a hot, sunny spot just can't sip up water fast enough to keep its leaves happy. Young trees with shallow roots hit that wall first. The fix is easy: water deeply through dry weeks, ring the base with a 2 to 3 inch (5 to 8 cm) layer of mulch to lock in moisture, and hand it a bit of afternoon shade if your summers really cook.
Fix:
- Provide deep, regular watering during heat and drought
- Apply a 2-3 inch organic mulch layer to conserve soil moisture and keep roots cool
- Site in partial afternoon shade in hot climates
A chalky white film showing up on the leaves
See that pale, dusty coating? That's powdery mildew, a fungus that loves humid air, deep shade, and crowded growth where the air just sits. It'll pucker a few leaves, but it hardly ever does real harm. Open up the canopy so air can move, pluck off the leaves that look worst, and only bother with a labeled fungicide if an outbreak really gets going.
Fix:
- Improve air circulation by thinning and proper spacing
- Remove and dispose of affected foliage
- Apply a labeled fungicide if infection is severe
Little angular brown to purple spots on the leaves
Those angular, dark-rimmed spots are septoria leaf spot, a fungus that usually turns up later in the year after the leaves have stayed wet for a good while. Here's the easy tell: it dots the leaf instead of browning the edge like scorch does. Rake up and toss the fallen leaves so the spores can't hang around over winter, keep water off the foliage, and only reach for a labeled fungicide if the tree really starts shedding leaves.
Fix:
- Rake and dispose of fallen infected leaves
- Avoid overhead watering and wetting foliage
- Apply a labeled fungicide only if defoliation is significant
Toxicity
Good news all around here. Kousa dogwood is non-toxic to pets, livestock, and people, and its ripe pinkish-red fruit is actually really nice to eat. So there's no part of this tree you need to fence off or stress about a curious pet nibbling.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
Worried about the cat? No need, because there's nothing toxic in this tree for them. If one chews a leaf, the worst you'll see is a quick, mild stomach grumble, just like with any non-food plant, and it passes on its own.
Dogs Safe
Dogs can chew the leaves, bark, or a fallen fruit and there's really no risk to speak of. A big gulped mouthful might bring a bit of passing tummy trouble, but that sorts itself out.
Horses Safe
Horses are just fine around this tree, both the leaves and the fruit. There's no reason to fence it off from a paddock.
Rabbits Safe
Rabbits can nibble the leaves without any worry. Like any new green though, ease it in slowly so a sudden diet switch doesn't upset their tummy.
Livestock Safe
Cattle, goats, and sheep can graze around it no problem, since there's nothing in the tree that'll bother them.
Birds Safe
Birds go wild for the ripe fruit and spread the seed around while they're at it. So it's a handy food source, not a hazard.
People Safe
The ripe pinkish-red fruit? Perfectly good to eat, sweet and soft inside, and the rest of the tree's harmless too. Most folks just leave behind the thin skin and the gritty seeds.
No special handling required; ingestion of plant material may rarely cause mild, transient gastrointestinal upset as with any non-food plant.
Varieties
Most kousa dogwoods you'll spot for sale are named picks, chosen for their flowers, their leaves, or how tough they are. Here are the ones worth knowing by name.
Milky Way
This one's a heavy bloomer, often filed under var. chinensis, that piles on creamy-white bracts and then follows up with loads of fruit.
Wolf Eyes
A compact, slow grower whose green leaves come edged in crisp white, which makes it a great pick if you've got a smaller garden and want brighter foliage.
Satomi
Want something other than white? This one swaps in deep pink to rose bracts instead.
Cornus × rutgersensis (Stellar series)
These Rutgers hybrids of Cornus florida and Cornus kousa, like Aurora, Constellation, and Stellar Pink, were bred to shrug off anthracnose and borers.
How to propagate
Want more kousa dogwood? There are a few ways to go, from slow and unpredictable seed to the lazy layering trick that barely asks anything of you. Which one suits you comes down to whether you need an exact copy of a named tree.
SeedModerate
Sow cleaned seed in fall or after cold-moist stratification in late winter. · Several years to reach flowering size
First, clean the pulp off the seed. Then either sow it in fall or give it a cold-moist stratification and sow in late winter, which is what wakes it up to sprout. Just be patient, because a seedling takes several years before it'll flower. And here's the catch: seedlings come up all different, so you can't count on one matching the parent tree.
Stem cuttingsModerate
Take softwood to semi-hardwood cuttings in late spring to summer. · One growing season to root and establish
Grab softwood to semi-hardwood cuttings from late spring into summer, dip them in rooting hormone, and keep them under mist. They'll root over a single growing season, and the good news is kousa cuttings take more easily than a lot of other trees do.
GraftingDemanding
Graft named cultivars onto seedling rootstock in late winter or summer. · One to two seasons to establish union
This is the fiddly one, where you graft or bud a named cultivar onto seedling rootstock in late winter or summer. The union knits together over one to two seasons. It's how nurseries keep cultivars true to type, because seed-grown trees just won't be.
LayeringEasy
Layer low flexible branches in spring. · One to two growing seasons to root
The easiest route for a home gardener? Layering. Just pin a low, bendy branch to the ground in spring and let it root there. Give it one to two growing seasons, then you can cut it free and move your new plant.
Myths
Kousa dogwood catches anthracnose and borers just as badly as the native flowering dogwood.
Not so, actually. Cornus kousa handles both dogwood anthracnose and the dogwood borer way better than Cornus florida does. It's the tree to plant where anthracnose has been a headache before, and that's exactly why it gets recommended as a swap-in so often.
The red raspberry-like fruit is poisonous and shouldn't be eaten.
Nope, the pinkish-red fruit is totally fine to eat, soft and sweet once it's fully ripe. Birds and other wildlife munch on it too, so it pulls double duty as a snack and as a magnet for the garden.