Fatsia Outdoor Care Guide

Fatsia is one of the easiest hardy exotics you can grow in the UK and brings an effortless jungle look to any corner. It's an evergreen shrub that can grow up to 4 metres tall over 10 to 20 years.

You may know it as the Castor Oil Plant (strictly the false castor oil plant, as it is unrelated to Ricinus communis) or the Japanese aralia. It is also often purchased as a houseplant for cool, bright rooms, and it copes indoors, but it is a far better garden plant.

Hardiness at a glance

Where is best to plant Fatsia japonica

Shade is the most important factor for Fatisa. Fatsia grows well in partial or full shade, and the RHS confirms it tolerates full shade better than almost any other evergreen of this size. Deep green, glossy leaves are the whole point of the plant, and they stay largest and darkest out of direct light. In hot afternoon sun the foliage bleaches and scorches, especially on dry soil, so a south-facing border is the worst place for it unless the ground stays moist.

Exposure matters as much as light. The leaves are big sails, and cold, drying winds tatter and scorch them in winter even when the temperature never approaches the plant's limit. A sheltered spot against a north or east wall, in a courtyard, under high tree canopy or among other shrubs suits it perfectly. Coastal gardens generally grow excellent fatsias because winters are milder, though salt-laden gales still mark the foliage.

Soil is the easy part. RHS lists clay, chalk, sand and loam as all suitable, at any pH, provided the ground is moist but well drained. It handles heavy clay better than most exotics. The one thing it resents is winter waterlogging, so on saturated ground plant slightly proud on a mound. If you are furnishing a dark border, it pairs naturally with the rest of our plants for shade.

Planting Fatsia

Spring is the best planting window, from March to May, which gives a full growing season for roots to establish before the first real frost. Early autumn planting works in mild areas, but avoid planting into cold soil from November to February. Dig a hole twice the width of the rootball and no deeper, tease out circling roots, set the plant at the same depth it was in the pot, backfill, firm and water thoroughly. Allow 1.5 to 2 metres from neighbours unless you plan to prune, because a happy fatsia gets wider than most people expect.

In containers, choose a pot at least 40 to 50cm across with generous drainage holes and use a soil-based compost such as John Innes No 3, which holds moisture and keeps a top-heavy plant stable. Few big evergreens do better in a shaded pot, but remember that roots in a container feel the frost far more than roots in the ground. Our step-by-step planting guide, linked below, covers both jobs in more detail.

Watering and feeding Fatsia

Water regularly through the first spring and summer, a full can once or twice a week in dry spells, then taper off. Established plants in the ground are surprisingly drought tolerant in shade, though the leaves will droop to tell you when they are thirsty; they lift again within hours of a soak. Container plants need checking weekly all season and should never sit in a saucer of water over winter.

Feeding is light work. A mulch of garden compost in spring plus a scatter of balanced slow-release fertiliser is plenty for border plants. Feed pots monthly from April to August with a balanced liquid feed. Gardeners' World also suggests removing the berries that follow flowering if you want the largest possible leaves, since seed takes energy the plant would otherwise spend on foliage.

Winter care for Fatsia

The most common winter alarm is also the most harmless: in a hard frost the whole plant wilts, with leaves hanging limp as if it has died overnight. This is a normal response to freezing, and the foliage lifts again on its own as temperatures rise. Do not water, feed or prune a drooped fatsia in frost. Just wait.

Real damage starts when a severe spell pushes past the plant's tolerance, particularly with wind. Leaves can scorch at the edges, blacken or drop below around -10°C, and a young or newly planted specimen is markedly more vulnerable than an established one. Even after a bad winter strips it, an established fatsia usually reshoots from the stems or the base in late spring, so give it until June before writing anything off. Wet cold is worse than dry cold: a plant sitting in saturated soil through a freeze suffers root damage that shelter alone cannot prevent, which is why drainage at planting time is part of winter care.

For the first two or three winters, fleece young plants when forecasts drop below about -5°C, mulch the root zone 5cm deep in late autumn, and move pots against the house wall or into an unheated porch during the coldest snaps. The full routine, including fleece weights and pot wrapping, is in our winter protection guide.

Pruning and maintenance for Fatsia

Fatsia needs no routine pruning, but it responds so well to the secateurs that you should never tolerate a leggy one. Plants grown in deep shade or left alone for years end up as bare stems with a mop of leaves on top. In mid to late spring, once frosts have passed, cut those bare stems back hard, by a third or even to 30 to 45cm from the ground. New shoots break readily from old wood and the regrowth is dense and lush. The classic mistake is pruning in autumn, which forces soft growth just as frost arrives.

Spring is also the moment to tidy: remove any leaves scorched by winter, cut out frost-killed shoot tips back to healthy wood, and take out one or two of the oldest stems on mature plants to keep the framework young. Wear gloves, as the sap irritates some skin.

Leave the flowers alone in autumn. The creamy-white drumstick umbels open in October and November, when almost nothing else is producing nectar, and on a mild day they hum with hoverflies and late bees. Black berries follow; they are ornamental only and not for eating, so snip the trusses off if children use the garden, which also boosts next year's leaf size.

Problems to watch for when growing Fatsia outdoors

Drooping leaves top the list, and the cause is almost always one of two things: frost, covered above, which fixes itself, or dry roots, which a deep soak fixes within a day. Persistent drooping in mild, moist conditions points instead at waterlogged soil suffocating the roots, so check drainage before you reach for the watering can again.

Scorched or bleached patches mean too much sun or wind exposure rather than disease. Move a pot, or accept marked older leaves and improve shelter; new growth will be clean. Yellowing and dropping of the lowest, oldest leaves is normal turnover on an evergreen and no cause for action if the new growth looks strong.

Pests are minor outdoors. RHS lists scale insects, thrips and mealybugs, which mostly trouble fatsias grown indoors or in very sheltered courtyards; wipe or spray small infestations early. Capsid bugs occasionally pepper new leaves with ragged holes in summer. On the disease side, leaf spot causes cosmetic brown blotches in wet seasons, worth clearing fallen leaves for, and honey fungus is the one serious, if uncommon, threat: a plant that collapses in summer with white fungal sheets under the bark at soil level should be removed.

Ready to grow Fatsia in your garden? Explore our varieties here →