Where to Plant Fatsia Japonica So the Leaves Stay Dark Green

Shade is not a compromise for this plant

Most shrubs sold for shade are tolerating it rather than enjoying it, and they show that by growing thin and flowering poorly. Fatsia is the exception. It evolved under closed woodland canopy on coastal hillsides, and its enormous palmate leaves are built to catch what little light gets through. Put it against a north-facing wall, under the skirt of a mature tree, or down the shaded side passage that nothing else will fill, and it produces its best foliage: leaves up to sixteen inches (40 cm) across, held almost flat, in a deep glossy green that reads as black from a distance.

Full sun does the opposite. In open sun the leaf pigment breaks down and the whole plant turns a pale, washed-out yellow-green, with brown scorch along the lobe tips and a hard, curled leaf surface. It is not a nutrient problem and no amount of feeding corrects it. Gardeners frequently dose a sun-bleached fatsia with fertilizer for two seasons before working out that the plant simply needs to be somewhere darker.

The practical rule is easy: if a spot gets more than two or three hours of direct summer sun, it is too bright. Morning sun until mid-morning is acceptable in cool climates. Direct afternoon sun in summer is not, anywhere. Reflected light off a pale wall counts too, so a white-rendered courtyard is brighter than it looks.

Reading a site before you dig

Beyond light, fatsia asks for two things: shelter from cold drying wind, and soil that never dries to dust and never stays waterlogged. The big soft leaves lose water fast, and a plant in a wind funnel between two buildings will brown along every edge even in perfect shade. Wind damage and sun damage look similar, which is why people misdiagnose one as the other; wind scorch is worst on the windward side of the plant, sun scorch is worst on the side facing the light.

Allow far more room than the young plant suggests. A nursery specimen in a three-gallon pot looks modest, but a settled plant in good shade reaches six to ten feet (2 to 3 m) tall and just as wide, with individual leaves the size of dinner plates. Planted eighteen inches (45 cm) from a path it will block the path within four years. Give it a five foot (1.5 m) radius of clear space, or accept that you will be pruning it hard on a schedule.

Planting, step by step

Autumn and early spring are both good, with autumn slightly better in mild climates because the roots get months of cool damp soil before the first hot spell. Avoid planting in the middle of summer; the leaf area is too large for a disturbed root system to support.

1. Soak the root ball first Stand the pot in a bucket of water until bubbles stop rising, usually twenty minutes. A dry peat-based root ball planted into damp soil will stay dry for weeks because water runs around it rather than into it.
2. Dig wide, not deep Make the hole two to three times the width of the pot but no deeper than the root ball is tall. Fatsia roots run outward in the top twelve inches (30 cm) of soil, and a hole dug deep and backfilled loose lets the plant sink and settle too low.
3. Improve the whole bed, not just the hole Fork two to four inches (5 to 10 cm) of leaf mold or garden compost across the planting area and into the top spit. Enriching only the hole creates a sump that holds water in heavy ground and discourages roots from leaving it.
4. Set the crown level with the surrounding soil The junction of stem and roots should sit exactly at finished soil level. Planted proud, the root ball dries out; planted deep, the base of the stem stays wet and rots.
5. Firm, water heavily, then mulch Firm with your heel around the edge of the root ball, not on top of it. Water with two full cans, then lay two inches (5 cm) of bark or leaf mold over the whole area, keeping it an inch clear of the stem.
6. Water through the first two summers A full can every week in dry weather for the first two growing seasons. After that an established plant in shade rarely needs watering except in a long drought.

Containers and indoor positions

Fatsia takes to a large pot better than most big evergreens, which is why it turns up so often on shaded balconies and in stairwells. Use a container at least eighteen inches (45 cm) across, a soil-based compost rather than a light peat mix so the plant does not blow over, and check the drainage holes are genuinely open. In a pot the plant stays around four to six feet (1.2 to 1.8 m), which suits most spaces.

Indoors, the same light rule applies but inverted in practice: almost no indoor position is too dark, and almost every window that gets direct sun is too bright. A spot three to six feet (1 to 2 m) back from a north or east window is right. What kills indoor plants is not gloom but dry heat and a saucer left full of water. Keep it away from radiators and heating vents, and tip the saucer out half an hour after watering.

Container plants need feeding, unlike plants in the ground. A balanced slow-release feed applied once in spring is enough for the whole season. Overfeeding produces long soft stems with widely spaced leaves, which is the beginning of the legginess problem that later needs a hard cut.

Write down the planting date, the compass direction the plant faces, and roughly how many hours of direct sun the spot gets in midsummer. If the leaves pale later, that record tells you immediately whether light is the cause or whether you should be looking at the roots.