Camellia: What It Is and How to Grow It

Updated

Camellia is a genus of evergreen flowering shrubs and small trees grown for their glossy leaves and long-lasting blooms in late winter and spring. They succeed in mild, sheltered gardens with acidic, well-drained soil and partial shade; they are not a good choice for exposed, windy sites, thin chalky soils, or very cold inland gardens where buds and open flowers are routinely frosted.

What Camellia Is

Camellias are woody evergreens in the tea family. Gardeners grow them mainly for flowers, though the same genus includes the plant that produces tea. Leaves are leathery, usually dark green and glossy, and most garden forms keep them year-round, so the shrub provides structure even outside the flowering season.

Three groups dominate gardens, and the differences matter when you are choosing a plant:

Group Typical bloom time Flower character Common garden use
Camellia japonica Later winter to spring Large, often formal double or semi-double blooms Specimen shrub, woodland border, cut flowers
Camellia sasanqua Earlier, often autumn to early winter Smaller, often single or semi-double, sometimes fragrant Hedging, screening, walls, containers
Camellia reticulata Late winter to spring Very large, open, often semi-double flowers Sheltered specimen where space allows

The practical consequence is timing. A sasanqua extends the season into autumn and takes clipping well enough for hedging; a japonica gives the classic large blooms but flowers later and is usually grown as a standalone shrub. Reticulata hybrids are the showiest but generally the least tolerant of cold and exposure, so they suit a protected wall or a mild garden.

Choosing a Planting Site

Site selection decides more of a camellia's fate than any aftercare. The plant wants:

  • Partial shade, ideally with light filtered through a high canopy. Deep shade reduces flowering; hot afternoon sun scorches leaves and can bleach flowers.
  • Shelter from cold and wind. Evergreen leaves desiccate in drying winter wind, and buds are the first casualty of hard frost.
  • Protection from early morning sun in frosty weather. Sun on frozen buds and flowers causes rapid thawing and browning. A site shaded until mid-morning avoids much of this damage.
  • Acidic, well-drained soil, roughly pH 5.5–6.5. Camellias are lime-haters; on chalk or limestone they yellow and stall.
  • Moisture without waterlogging. They dislike both drought and sitting wet. If drainage is poor, plant on a slight mound or improve the soil before planting.

Where soil is alkaline, grow camellias in containers in an ericaceous compost rather than fighting the ground. This is also the practical route for a small courtyard or patio, provided the pot is sheltered and watered carefully.

Planting and Establishment

Bare-root and container-grown plants both work, but container-grown stock establishes with less risk and can be planted through much of the year when the ground is workable. Autumn and early spring are the safest windows; avoid planting into frozen or waterlogged ground.

  1. Prepare the hole. Dig a hole wider than the rootball but no deeper than the plant was growing before. Loosen the sides and base so roots can move out.
  2. Improve the backfill. Mix the excavated soil with plenty of organic matter such as leafmould or composted bark. Do not add lime or mushroom compost, which is often alkaline.
  3. Set the plant at the right depth. The top of the rootball should sit level with, or slightly above, the surrounding soil. Camellias are shallow-rooted and burying the base of the stem causes decline.
  4. Firm and water. Backfill in stages, firming gently to remove air pockets, then water thoroughly so the soil settles around the roots.
  5. Mulch. Apply a 5–8 cm layer of acidic organic mulch over the root zone, keeping it clear of the trunk. Mulch conserves moisture, suppresses weeds, and slowly feeds the shallow roots.

For the first season, water regularly during dry spells. Once established, camellias are reasonably drought-tolerant, but they never forgive prolonged drying at the root, especially while buds are swelling.

Routine Care

Watering. The critical periods are late summer, when flower buds are forming, and any dry spell in spring. Irregular moisture at bud formation is a common cause of bud drop.

Feeding. Use a fertiliser intended for acid-loving plants, applied in spring as growth starts and again in early summer. Avoid feeding late in the season, which encourages soft growth that winter damages.

Pruning. Little is needed beyond removing dead or crossing wood and lightly shaping after flowering. Prune immediately after bloom, because the plant sets next year's flower buds on the current season's growth; cutting later removes the coming display. Sasanqua hedges can be trimmed after flowering in the same way.

Mulching. Top up the organic mulch annually in spring, again keeping it off the trunk.

Frost and petal blight. Where frost threatens open flowers, a temporary fleece cover or a sheltered site is the practical defence. Petal blight, which turns flowers brown and mushy, is managed by picking and disposing of affected blooms and clearing fallen petals so the fungus cannot reinfect.

Troubleshooting Common Problems

  • Yellowing leaves between green veins. Usually a sign of alkaline soil or iron/manganese shortage rather than a pest. Check the soil pH and, if it is too high, move the plant to a container or an acid bed; a sequestered iron feed can help short term.
  • Bud drop. Often environmental: drought, waterlogging, sudden temperature swings, or a move to a new position. Check moisture and exposure before assuming disease.
  • Scale insects and sooty mould. Scale appears as small brown or white bumps on stems and leaf undersides, with sticky honeydew and black mould following. Improve air movement and treat the scale directly; the mould clears once the honeydew stops.
  • Leaf scorch or wind burn. Brown, dry leaf edges on the exposed side point to sun and wind rather than disease. Provide shelter or relocate.
  • Failure to flower. Usually too much shade, pruning at the wrong time, or buds lost to frost. Review light levels and pruning timing first.

Where to Go for More

The Rhododendron, Camellia & Magnolia Group (rhodogroup-rhs.org) is an international enthusiasts' group whose site is described as an expanding resource on the classification, cultivation and care of camellias alongside rhododendrons and magnolias. It suits growers who want to go beyond the basics, compare cultivars, and connect with other enthusiasts; the site also indicates a way to join. For a beginner, the practical starting point remains the same: pick a japonica or sasanqua suited to your climate, plant it in acid, drained soil in partial shade with shelter, and keep the roots evenly moist while buds form.