Shrub · Rutaceae
Japanese Skimmia
Skimmia japonica
Give it shade and acidic soil and this evergreen delivers fragrant spring flowers and bright winter berries.
Partial shade
Every 5–10 days
USDA 6–8
2–7 ft · 0.6–2.1 m
Overview
Japanese skimmia turns the shadiest corner of a garden into something worth walking out to see. This slow-growing evergreen shrub actually thrives in the shade that stops other flowering plants cold, which makes it a genuine problem-solver. It hails from the woodlands of Japan and China and sits in the citrus family, so those spring flowers throw off a wonderful spicy scent. Glossy dark leaves carry it right through the year, and clusters of red buds keep the display going even in the depths of winter.
Now for the part that makes skimmia so much fun to grow: most plants are either male or female, and that shapes the whole game. The males put on the bigger flower display, while only the females load up with those bright red berries that cling on through winter. Want the fruit? Set a male close enough to pollinate the females, and the pair works together to fill the border.
Get skimmia settled in the right spot and it rewards you with structure in every season for next to no effort. Acidic, moist soil and steady shade really are the whole trick. Miss them and the leaves yellow or scorch, but nail them and this shrub keeps looking sharp month after month, no matter what the weather throws at it.
Care
The short version: part to full shade, acidic and humus-rich soil kept evenly moist, and a male plant nearby to get berries going on the females.
Light
Skimmia craves part to full shade and pushes back hard against direct sun, which scorches the leaves fast. Hand it dappled light, or morning sun with afternoon shade, and it takes right off. Deep shade works too, though flowering dials back a bit where the light runs lowest.
Water
Keep the soil evenly moist but well drained, watering roughly every 5 to 10 days and stepping it up through a heat wave. Its thirst lands right in the middle, so it never wants to sit waterlogged. The one rule to hold: never let the root zone dry out fully once the heat kicks in.
Soil
Plant skimmia in moist, humus-rich, acidic ground that still drains freely and it really digs in. Aim for a pH of 5.0 to 6.5, on the acid side, and work in loads of organic matter. Let the soil swing alkaline, though, and it locks up iron, turning the leaves yellow.
Temperature
This shrub laughs off the cold, holding strong from -9°F (-23°C) at the low end to around 86°F (30°C) at the high. Hot, dry heat rattles it far more than frost ever will. That alone is reason enough to tuck it into the shade.
Humidity
Everyday outdoor air suits skimmia fine, so there is no humidity target to hit. The real threat is dry heat, which stresses the plant and rolls out the red carpet for spider mites. Keep the soil moisture steady and the air takes care of itself.
Feeding
Come spring, hand skimmia a balanced or acid-forming ericaceous fertilizer built for acid-loving shrubs. One feed a season does the trick for such a slow grower. That acidic feed pulls double duty too, helping hold the soil right where skimmia wants it.
Pruning
Skimmia keeps pruning to a minimum, which frees you up for other jobs. Shape it lightly after flowering to clear out anything damaged or heading the wrong way, then step back. The naturally rounded form fills in beautifully on its own.
Repotting
Growing it in a pot? Bump it up every 2 to 3 years into a slightly bigger container of fresh acidic mix to keep it charging along. Roots circling the pot or breaking out the drainage holes are your green light, and so is soil that dries out quicker than it used to.
Size & spacing
Give it space, because a mature shrub climbs to 2 to 7 feet (61 to 213 cm) tall and spreads even wider at 3 to 5 feet (91 to 152 cm). Leave that room and the rounded shape rounds out fully, standing proud without crowding its neighbors.
When to plant
Skimmia takes its time, and that patience pays off. Get new plants into the ground in spring or fall while the soil works easily, then watch the seasons deliver: fragrant flowers burst out from late winter into spring, and the red berries color up on female plants in fall and hang on all the way through winter.
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: Fragrant flowers late winter to spring (around April); red berries on female plants ripen in fall and persist through winter
Hardiness
USDA hardiness zones: 6–8
Temperature: down to -23°C
Troubleshooting
Keep skimmia's roots in acidic, shaded soil and it powers along happily, so nearly every hiccup traces back to the wrong spot or a sap-sucking pest. The good news is the leaves broadcast exactly what is going on. Spot the match below, then go after the root cause instead of chasing the symptom.
Yellow foliage laced with green veins
When a leaf goes yellow but the veins keep their green, you have caught interveinal chlorosis, driven by soil that has swung too alkaline for the roots to grab iron, with poor drainage piling on. Hit it head-on: drop the pH with elemental sulfur, feed chelated iron, and mulch with acidic organic matter, and the fresh growth greens right back up.
Fix:
- Lower soil pH with elemental sulfur or acidifying amendments
- Apply chelated iron and mulch with acidic organic matter
- Improve drainage
Speckled bronzing and fine webbing beneath the foliage
A bronzed, speckled cast over the foliage with fine webbing tucked underneath means spider mites have moved in, and they surge in hot, dry spells. Blast the leaves with water to knock them loose, then follow up fast with insecticidal soap or horticultural oil. Keep the plant watered and shaded from harsh sun and they lose their grip for good.
Fix:
- Spray foliage with water to dislodge mites
- Apply insecticidal soap or horticultural oil
- Improve air humidity and avoid drought stress
Sticky honeydew, bumpy stems, and sooty black mold
Sticky honeydew and a black film of sooty mold flag a sap-sucker at work, usually scale as raised waxy bumps or aphids swarming the soft new growth. Snip out the worst stems first to get ahead of it. Then smother any scale with horticultural oil and blast the aphids off with insecticidal soap.
Fix:
- Prune out heavily infested stems
- Apply horticultural oil to smother scale
- Use insecticidal soap for aphids
Scorched, bleached foliage on the sun-struck side
Skimmia is built for shade, so leaves that brown or bleach are almost always soaking up too much direct sun, with the damage striking the exposed side while shaded foliage stays green. Shift it somewhere shadier, or give it morning sun with afternoon shade, and mulch to take the pressure off.
Fix:
- Provide part to full shade or morning sun with afternoon shade
- Transplant to a shadier site if needed
- Mulch and water to reduce stress
Toxicity
Here is the one thing to take seriously before you plant. Skimmia is poisonous, since the leaves and those bright red berries pack alkaloids called skimmianine along with glycosides. The berries are the real hazard because they look so tempting to reach for. Swallowing them triggers vomiting and drooling, and a big amount can reach the heart and nerves, so keep the fruit clear of children, pets, and grazing animals.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
The leaves and berries carry skimmianine, so a cat that nibbles them quickly starts to drool and vomit. A big enough mouthful can drive the heartbeat racing or unsteady, so keep it well out of paws' reach.
Dogs Toxic
A dog that chews the foliage or the red berries breaks into drooling and vomiting in no time. Eat enough and the alkaloids start rattling the heart and nerves, so keep curious noses away.
Horses Toxic
Let a horse graze the leaves or fruit and it ends up drooling, off its feed, and queasy, with heart and nervous trouble kicking in after a large amount.
Rabbits Toxic
These alkaloids spell trouble for a small grazer. Even a little leaf or berry sets off drooling and a churning gut, so keep skimmia well beyond a rabbit's reach.
Livestock Toxic
Cattle, sheep, and goats react badly to the foliage and berries, breaking into salivation and digestive upset that can tip into heart and nervous effects after a heavy feed.
Birds Toxic
The berries look like an easy grab, but the skimmianine loaded inside is poisonous. A bird that swallows the fruit can sicken fast, so treat it as strictly off limits.
People Caution
No part of this plant is food, and the showy red berries are the real hazard for a curious child. Swallowing them sparks nausea and an upset stomach, with heart effects possible after a large amount.
Keep berries away from children and pets; wash hands after handling.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
A handful of named skimmias show up again and again, and picking one is half the fun: it all comes down to whether you are chasing flowers, berries, or both. Here are the standouts worth hunting down.
Rubella
A go-to male clone grown for its dark red flower buds that hold their color all winter before bursting open into fragrant white flowers, though it sets no berries of its own.
Nymans
A female cultivar that piles on heavy crops of large, bright red berries whenever a male grows close enough to pollinate it.
Fragrans
A male cultivar prized for the powerful scent its white flower panicles pump out in spring.
Companions
Skimmia thrives next to other shade-loving, acid-soil plants that ask for the same conditions, which makes it an easy fit in a woodland border.
Plant near
Rhododendron: Shares the same acidic soil and part-shade conditions.
Camellia: Both are shade-tolerant broadleaf evergreens that thrive in acidic, moist, well-drained soil.
Hosta: Pairs well as a shade-garden understory companion with similar moisture needs.
How to propagate
Ready to make more skimmia? You can run with cuttings or seed, but cuttings win for most growers, since they lock in the parent's traits and, best of all, its sex.
Stem cuttingsModerate
Late summer to fall · Several weeks to a few months to root
Cuttings are the route that rarely lets you down. Take semi-hardwood cuttings in late summer or fall and root them under humidity, where they dig in over several weeks to a few months. Just remember each cutting carries the parent's sex, so you still want both a male and a female plant nearby to get berries.
SeedModerate
Fall, from ripe berries · Germination can be slow and seedlings take years to mature
Feeling patient? Sow seed cleaned from ripe berries in fall, but brace for a slow ride. Germination drags, the seedlings take years to reach flowering size, and they come up variable, so you will not know if a seedling is male or female until it finally blooms.
Myths
A solitary skimmia will load itself with red berries.
Skimmia runs mostly dioecious, meaning plants split into separate males and females, and only the females fruit. A male has to grow nearby to pollinate them, roughly one male working six females for a full crop, so a lone plant or a male on its own hands you zero berries. Plant them in pairs and the berries follow.