In short
- Evergreen, low shrub (0.6–1.5 m) for shade and semi-shade — one of the few ornamental shrubs that grow well in DEEP shade.
- DIOECIOUS: for 5–6 FEMALE shrubs you need 1 MALE nearby, otherwise no berries. The exception is the cultivar 'Reevesiana' — self-fertile.
- Strongly acid-loving (pH 4.5–6.0) — needs substrate and care like a rhododendron. Hard tap water is harmful.
- Ornamental YEAR-ROUND: fragrant white/pink flowers in spring, red berries lasting through winter in autumn, and in male cultivars (e.g. 'Rubella') additionally bright red WINTER BUDS.
- ALL parts — especially the berries — contain skimmianine alkaloids; mildly toxic to humans and pets.
- Grows SLOWLY — patience and compact size are its features; pruning practically not required.
Botanical data
- Family
- Rutaceae (Rutaceae)
- Height
- 0.6–1.5 m
- Width
- 0.8–1.5 m
- Habit
- Rounded
- Growth rate
- Slow
- Position
- Partial shade, Shade
- Soil
- Humus-rich, Peaty
- pH reaction
- pH 4.5–6
- Moisture
- Moist
- Bloom
- April–May
- Hardiness
- USDA 6a–8b
- Propagation
- From cuttings, By layering
Characteristics
A compact, rounded, evergreen shrub, usually 0.8–1 m tall and about as wide (rarely to 1.5 m). The leaves are leathery, elliptic or ovate, 8–12 cm long, dark green and glossy, densely arranged at the tips of shoots — when crushed they release a slightly aromatic scent (Rutaceae contain essential oils). Flowers open in April and May in dense, upright panicles at the shoot tips; they are small, white or pinkish, with an intense sweet fragrance carrying several metres, and in male cultivars (the best known being 'Rubella') the flower buds are BRIGHT RED already from autumn and stay ornamental through the whole winter — one of the strongest features of the species in Polish conditions. Male and female flowers grow on separate plants (dioecious species): only on female specimens, after pollination with pollen from a male shrub, do round, bright red, fleshy berries form, 6–10 mm across. Fruits ripen in autumn and stay on the shrub through the winter until spring, giving the garden a strong colour accent in the poorest season. The shrub is hardy to about −18 °C (USDA 6a), but in Poland it suffers more from winter sun striking ice-covered leaves than from frost itself — hence always plant in shade or semi-shade.
Growing and care
Watering
Requires constantly moderately moist substrate — tolerates neither drought (leaves yellow and fall) nor waterlogging. In heat, water less often but thoroughly, with rainwater or stagnant water (does not tolerate hard tap water — it is strongly acid-loving).
Fertilizing
Moderate, EXCLUSIVELY with fertiliser for acid-loving plants (as for rhododendrons and blueberries). An ordinary universal fertiliser raises the pH and triggers chlorosis — yellow leaves with green veins.
Planting
Shady or semi-shady site, sheltered from morning winter sun (it scorches leaves after an ice-covered night). The soil must be acidic (pH 4.5–6.0), humus-rich, well-drained and constantly moist — as for rhododendron. On neutral and calcareous soils the plant suffers chlorosis. Mulching with pine bark is practically obligatory.
Pruning
Skimmia grows slowly and naturally forms a compact, rounded shape — it needs no formative pruning. It is enough to remove damaged or weak shoots. Any shortening of long shoots should be done AFTER flowering and only lightly, to preserve the buds set for the next season.
Companion plants
Good companions
Identical requirements — acidic, moist soil, shade or semi-shade, shelter from winter winds. Skimmia fills the lower layer under sprawling rhododendrons well and brings winter buds and berries when the rhododendrons are only a mass of green.
The same growing niche (acidic, moist, shaded site); skimmia as an evergreen gives structure under the deciduous azalea.
Bad companions
They require neutral or alkaline pH — extremely at odds with the acid-loving requirements of skimmia. Joint planting always ends with chlorosis on one of the sides.
The evidence level indicates whether the relationship is backed by research, observation, or gardening tradition.
Toxicity
| For whom | Level | Notes |
|---|---|---|
| Humans | Moderate | All parts of the plant — especially the red berries — contain alkaloids of the skimmianine group. Eating a few berries causes nausea, vomiting and stomach irritation. Do not plant in a garden with small children without their being aware that the bright red beads are not edible. |
| Dogs | Moderate | Skimmianine alkaloids are toxic to dogs; ingestion of berries requires veterinary advice. |
| Cats | Moderate | As for dogs — do not plant in gardens easily accessible to free-roaming cats. |
History and origin
The species was described in the 19th century by the Dutch botanist Friedrich Anton Wilhelm Miquel from Japanese collections; the genus name Skimmia comes directly from the Japanese folk name „mijama-shikimi”. It was introduced into European cultivation in the second half of the 19th century, initially in British and Dutch botanical gardens. Its real career, however, began in the 1990s with the fashion for winter gardens and „green moments” in the cool season — the dioecious male cultivar 'Rubella' with its lasting, bright red winter buds dominated Dutch and German garden centres and is today one of the most widely sold winter shrubs in Western and Central Europe.
Uses
For shady and semi-shady corners of the garden on acidic, humus-rich soil — under deciduous trees, in a border with rhododendrons and azaleas, along a north wall. The low, compact silhouette and year-round ornamental value (spring flowers, berries and winter buds) make it a first-choice species for the winter garden. In small gardens, opt for the self-fertile 'Reevesiana' or two–three female cultivars with one male ('Rubella') playing a double role — pollen source and ornamental specimen. Container growing is possible but requires ericaceous substrate, regular watering with rainwater and root protection for winter (a pot freezes faster than the ground). Because of the mildly toxic berries, do not plant in gardens where small children roam freely and cannot tell ornamental berries from edible ones.
Trivia
- The genus name Skimmia comes from the Japanese „mijama-shikimi” — literally „shikimi of the mountain forests”; „shikimi” is actually the name of the unrelated star anise, but the leaf shape was once confused.
- The cultivar 'Rubella' is a MALE specimen — its bright red winter buds will never set berries, but they are the main attraction of the shrub; for fruits one must add a female cultivar (e.g. 'Nymans').
- Skimmia belongs to the same family as citrus fruits and rue (Rutaceae) — crushing a leaf releases a characteristic citrusy aroma of essential oils.
- The cultivar 'Reevesiana' is an exception to the rule of dioecy: a self-fertile hermaphrodite that sets berries by itself without a pollinator — ideal for small gardens where only one shrub will fit.
Frequently asked questions
Why does my skimmia have no berries?
Skimmia japonica is DIOECIOUS — male and female flowers occur on separate shrubs, and berries form ONLY on female specimens pollinated by pollen from a male plant growing nearby (up to 10–15 m). If you have a single plant and it is a male specimen (e.g. 'Rubella'), you will never have berries — that is normal. The solution is to add a female cultivar ('Nymans', 'Foremanii', 'Veitchii') OR plant the self-fertile hermaphrodite 'Reevesiana', which sets berries on its own.
My skimmia has yellow leaves with green veins — what is it?
That is classic chlorosis of acid-loving plants — a symptom of too high soil pH. Skimmia requires a distinctly acidic substrate (pH 4.5–6.0), like rhododendron and blueberry. Feed it with a fertiliser for acid-loving plants (iron chelate), acidify the soil with peat or a specialised mulch, and replace hard tap water with rainwater. If the garden soil is calcareous, it is better to grow skimmia in a container with ready ericaceous compost.
Are skimmia berries toxic?
Yes, mildly. All parts of the plant — including the bright red berries — contain alkaloids from the skimmianine group. Eating a few berries causes nausea, vomiting and stomach irritation in people. These are not fruits on which one can seriously poison oneself, but do not plant the shrub where a small child might mistake the red beads for edibles. Toxicity also affects dogs and cats.
Does skimmia tolerate sun?
Not under our climatic conditions. Full sun, especially southern in summer and winter sun striking ice-covered leaves, leads to yellowing and scorching of the blades. Skimmia is a shade species — plant it in shade or semi-shade, best under the canopy of deciduous trees or by a north or east wall of the house.
Sources
- Plants of the World Online (POWO)Database (GBIF, POWO…)
- RHS — Skimmia japonicaInstitution / botanical garden
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