Sweet box (Himalayan sweet box)

Sun

Partial to full shade; protect from strong afternoon sun and cold, drying winds.

Water

Keep evenly moist while establishing. Established plants tolerate some dry shade, but water during prolonged drought.

Soil

Humus-rich, well-drained soil that retains some moisture; tolerates acidic, neutral and alkaline conditions.

Height

3-5 ft (0.9-1.5 m)

Spread

3-5 ft (0.9-1.5 m), eventually wider through suckering

Flowers

Winter to early spring; small, creamy-white flowers, often pink-tinged, with a strong sweet fragrance.

Foliage

Evergreen. Narrow, pointed, glossy dark-green leaves on slender stems; young stems can be reddish or purple.

Growth

Slow

Care needed

Low

• Pollinators
• Deer resistant
• Drought tolerant
• Wildlife
• Low allergen
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   1.9 ft (0.59 m)

3. After 2 years

   2.2 ft (0.68 m)

4. After 3 years

   2.5 ft (0.76 m)

5. After 5 years

   3 ft (0.94 m)

About 8 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Slow

• Water deeply during dry spells through the first two growing seasons.
• Apply leaf mould or compost as mulch each spring, keeping it clear of the stem bases.
• Water established plants during prolonged drought, especially beneath trees or beside walls.
• Avoid routine heavy feeding; a spring compost mulch is usually sufficient.
• Remove unwanted suckers at their point of origin if you need to limit the clump.

Pruning. Prune lightly after flowering, removing dead, damaged or awkwardly placed stems. Shorten individual shoots rather than shearing the whole shrub, so its natural shape is retained.

Winter

Enjoy the scented flowers and check for wind scorch or drying soil beneath overhanging eaves.

Early spring

After flowering, remove damaged stems and lightly reshape only where needed.

Spring

Apply a compost or leaf-mould mulch and lift rooted suckers if you want more plants.

Summer

Water young plants and established clumps during prolonged dry weather.

Late summer

Take semi-ripe cuttings from healthy, non-flowering shoots.

Autumn

Plant while the soil is moist and workable; in colder areas, wait until spring.

• Plant beside a shaded entrance or frequently used path so the winter fragrance is easy to notice.
• Use in loose groups beneath deciduous trees, with spring bulbs appearing through the evergreen foliage.
• Combine with ferns, hellebores and epimediums for a layered woodland border.
• Grow as a low, informal evergreen edging along a sheltered courtyard or shaded boundary.

Garden styles it suits: Woodland, Winter interest, Sensory garden, Low-maintenance, Secret garden and Small-space.

Plant it with: Hellebores, Snowdrops, Epimediums, Japanese painted fern, Hardy cyclamen and Lungwort.

Wildlife: The flowers provide nectar and pollen for insects active during mild winter weather. The dense evergreen growth also offers shelter for small garden wildlife.

• Yellowing or scorched leaves in strong sun: provide afternoon shade and check that the roots are not drying out.
• Brown leaf edges after cold, drying winds: choose a sheltered position and remove damaged growth after the risk of severe frost has passed.
• Root rot in waterlogged soil: improve drainage or move the plant; do not leave roots standing in saturated ground.
• Scale insects occasionally settle on stems or leaves: wipe off small infestations and use a labelled horticultural oil if necessary.

Not known to be toxic to people, cats, dogs or horses. No part is established as a serious poisoning hazard, but the dark berries are ornamental rather than edible; discourage children and pets from eating them.

• Dwarf Himalayan sweet box (Sarcococca hookeriana var. humilis)

  Usually forms a much lower, spreading groundcover, around 1-2 ft (0.3-0.6 m) tall, rather than the taller, more upright clump of var. digyna.

• Sweet box (Sarcococca confusa)

  Generally has broader, more oval leaves and a denser, rounded habit; var. digyna has noticeably narrower leaves and often reddish young stems.

• Christmas box (Sarcococca ruscifolia)

  Typically has broader leaves and red ripe berries, whereas var. digyna has narrow leaves and purple-black ripe berries.

Sarcococca comes from Greek words meaning flesh and berry, referring to its fleshy fruit.

Propagation. Lift and replant rooted suckers in spring, keeping as much root as possible. Alternatively, take semi-ripe cuttings in late summer; rooting can be slow.

Accepted botanical name

Sarcococca hookeriana digyna

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.