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Boxwood is a slow, tough evergreen for hedges and topiary, hardy in USDA zones 5-9 (RHS H6) and happy in sun or shade. Clip in early summer once the first flush has hardened, and give a second light trim in late summer; clipping in frost or hot midday sun scorches the cut leaves. Keep it well fed and mulched, because stressed plants are the ones that get box blight. All parts are toxic to cats, dogs and horses. Plants cost $15-$60.
Key facts
- Toxic to cats, dogs and horses. The alkaloids in leaves and bark cause vomiting, diarrhoea, colic and, in horses eating quantities, serious illness. Livestock deaths from box hedge clippings are well documented.
- Clipping timing matters for appearance, not flowering: clip after the first flush hardens in early summer, avoiding frost, hot midday sun and late-autumn cuts that leave soft growth exposed to winter.
- Box blight (Calonectria pseudonaviculata) causes bare brown patches and defoliation. Good airflow, clipping in dry weather and cleaning tools between plants are the practical defences.
- Box tree moth caterpillars can strip a mature hedge in weeks and are now widespread across Europe, the UK and increasingly North America.
Care requirements#
| Plant type | Evergreen shrub, long-lived; used for hedging, edging and topiary |
| Growing medium | Any well-drained garden soil, including chalk and clay if it does not waterlog |
| Light needs | Full sun to deep shade; one of the few formal evergreens that performs in shade |
| Water frequency | Water new plants weekly for the first two seasons; established hedges only in drought |
| Hardiness zone (USDA) | 5-9 for B. sempervirens; Korean types (B. sinica var. insularis) to zone 4 |
| Hardiness zone (RHS) | H6. Fully hardy across the UK |
| Bloom season | Insignificant scented cream flowers in spring, popular with bees but not ornamental |
| Temperature range | Hardy to about -20°C; foliage can bronze in cold drying winds |
| Fertilizer | Balanced or high-nitrogen feed in spring; underfed box is far more prone to blight |
| Soil pH | 6.5-7.5 (neutral to slightly alkaline). One of the few shrubs that prefers chalk |
| Drainage needs | High: box hates sitting wet, particularly in winter |
| Toxicity | Toxic to cats, dogs, horses and livestock. Contains buxine and related alkaloids causing vomiting, diarrhoea, colic and, in quantity, severe illness. Never dispose of clippings where animals graze. |
Growth & propagation#
| Mature size | 1-5m if unclipped over decades; typically kept at 30cm-1.5m as hedging |
| Growth rate | Very slow, 10-15cm a year |
| Propagation methods | Semi-ripe cuttings in late summer, which root readily in a shaded cold frame |
| Propagation difficulty | Beginner-friendly, but plants take 3-4 years to reach usable hedging size |
| Repotting schedule | Container topiary every 2-3 years, into loam-based compost |
| Pruning timing | Main clip in early summer once the first flush of growth has firmed up, with an optional light tidy in late summer. Avoid clipping in frost, in hot direct midday sun (cut leaf edges scorch brown), and after early autumn, which leaves soft growth to be frosted. Renovation cuts into old wood are best made in mid spring. |
Common problems & troubleshooting#
| Symptom | Likely cause | Fix |
|---|---|---|
| Bare brown patches, black streaks on stems, leaves dropping | Box blight | Cut out affected growth well beyond the damage, bin (do not compost) all clippings, disinfect tools, thin for airflow, and avoid overhead watering |
| Webbing and stripped stems with green-and-black caterpillars | Box tree moth | Pick off caterpillars, use pheromone traps to time treatment, and spray with a Bacillus thuringiensis product on young larvae |
| Orange-bronze foliage in late winter | Cold and wind stress, or nutrient shortage. Usually cosmetic | Feed in spring; colour normally recovers as growth resumes |
| Brown scorched leaf edges after clipping | Clipped in hot direct sun or frost | Clip on an overcast day or in the evening, and water the plant well the day before |
Clip on a dry day at the right stage
Sodate reads your weather and growth flush, then flags the days that are safe to clip without scorching or spreading blight.
Seasonal care#
Varieties & cultivars#
| Variety | Distinguishing trait | Note |
|---|---|---|
| 'Suffruticosa' | Dwarf, very slow, tight habit | The traditional dwarf edging box for parterres; the most blight-prone |
| 'Faulkner' | Glossy rounded leaves, dense | Widely used for topiary balls, with better blight tolerance |
| Buxus microphylla var. japonica | Small leaves, tolerates heat and humidity | The usual choice in the southern US |
| Ilex crenata (Japanese holly) | Box-like small leaves, clips the same way | Not a Buxus at all, but the standard substitute where blight or box tree moth is severe |
Buying checklist#
- Foliage evenly dense with no bare brown patches or black-streaked stems
- No webbing, frass or caterpillars deep inside the plant
- Root ball well filled but not hard and pot-bound
- Buy from a nursery that quarantines stock, since blight arrives on bought-in plants
Pricing by region#
| Region | Price range | Typical unit | Basis |
|---|---|---|---|
| US | $15 – $60 | 2-3 gallon shrub | Nursery + garden centre retail |
| UK | $10 – $50 | 2-5L pot | Garden centre retail |
| India | $3 – $12 | 8in pot | Urban nursery retail |
| Australia | $12 – $50 | 150-200mm pot | Nursery retail |
| Canada | $18 – $65 | 2-3 gallon shrub | Garden centre retail |
USD figures are approximate conversions for comparison; switch the dropdown to see each region's actual local-currency listing price.
Often confused with#
Where it's actually grown#
Most European box is grown in the Netherlands, Belgium and Italy, where topiary specialists train shapes over many years. Box tree moth and blight have shifted a large share of the hedging market to Ilex crenata and Euonymus in recent seasons.
Import & biosecurity restrictions#
| Region | Note |
|---|---|
| Australia | Live plant imports restricted; grown domestically for formal gardens, mainly in cooler southern states. |
| US | Unrestricted domestic sale, though several states have box tree moth quarantines restricting movement of Buxus nursery stock. |
| UK | No restriction on sale; box tree moth and blight are widespread, and many gardeners now plant Ilex crenata instead. |
| India | No restriction; grown in hill stations and cooler-climate formal gardens rather than the hot plains. |
| Canada | CFIA has imposed box tree moth quarantine measures in parts of Ontario, restricting Buxus movement. |
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Frequently asked questions
Is boxwood toxic to dogs and cats?
Yes. All parts contain buxine and related alkaloids, causing vomiting, diarrhoea and abdominal pain in cats and dogs, and colic in horses. Clippings are especially dangerous if dumped where animals graze.
When should I trim boxwood?
Clip in early summer once the first flush of growth has hardened, with an optional light tidy in late summer. Avoid clipping in frost, in hot midday sun, or after early autumn, when soft regrowth would be frosted.
What causes brown patches in a box hedge?
Most often box blight, which also blackens the stems and drops leaves. Cut well beyond the damage, bin the clippings rather than composting them, disinfect tools between cuts, and thin the plant for airflow.
What can I plant instead of box?
Ilex crenata (Japanese holly) is the standard substitute where box blight or box tree moth is established. It clips almost identically but prefers acidic soil, whereas box prefers chalk.
How much does boxwood cost?
A 2-3 gallon shrub typically costs $15-$60 in the US and £8-£40 in the UK. Trained topiary shapes cost far more because of the years of clipping involved.
