How to Care for Hibiscus (Indoors & Outdoors)

Few plants make a patio feel like a holiday the way a hibiscus does — dinner-plate flowers, glossy leaves, and a new bloom almost every day in high summer. The catch is that "hibiscus" is really two very different plants, and most disappointment starts with treating one like the other. This guide covers both, plus the September job that decides whether your tropical hibiscus sees next summer: moving it indoors.

First, know which hibiscus you have

Tropical hibiscus (Hibiscus rosa-sinensis) has glossy, deep-green leaves and flowers in oranges, yellows, pinks, and multicolours. It grows happily in a pot, blooms non-stop in warmth — and dies in a real frost. Hardy hibiscus — rose of Sharon (Hibiscus syriacus) and the giant-flowered Hibiscus moscheutos — has duller, often lobed leaves, survives freezing winters in the ground, and comes back from the roots or old wood each spring. Everything in the overwintering section below applies to the tropical kind only.

Light

Hibiscus flowers on sunshine. Outdoors, give it six hours of direct sun a day; a little afternoon shade is welcome only in scorching climates. Indoors, park it right at your brightest south- or west-facing window — a metre back is already too dark for reliable blooming. A plant that grows lush leaves but few flowers is almost always asking for more light.

Watering and feeding

In summer, a potted hibiscus in full sun drinks fast — daily watering in a heatwave is normal. Keep the soil consistently moist but never let the pot stand in a saucer of water; soggy roots drop buds and yellow leaves. In winter, let the top few centimetres dry before watering again. Hibiscus is also a hungry plant: feed every one to two weeks from spring to early autumn with a balanced or high-potassium liquid fertiliser. Skip the classic high-phosphorus "bloom boosters" — heavy phosphorus actually suppresses flowering in hibiscus over time.

Pruning

Hibiscus flowers on new growth, so pruning triggers blooming rather than preventing it. In early spring, cut the whole plant back by about a third, snipping just above outward-facing buds. Through summer, pinch leggy shoots to keep the plant bushy. Hardy hibiscus is pruned the same way — hard, in spring — because the flowers come on the current year's shoots.

Why hibiscus buds drop

The most common hibiscus complaint is buds that swell, then fall unopened. Bud drop is a stress reflex, and the triggers are nearly always one of these:

• A move or sudden change — new spot, repotting, or coming indoors. Usually temporary; give it two to three weeks of stable conditions.
• Uneven watering — a bone-dry afternoon followed by a soaking is the classic trigger.
• Too little light, especially indoors in winter.
• Pests — check under leaves for aphids, whitefly, and spider mites before blaming anything else.

Tip: don't chase a stressed hibiscus around the house looking for a better spot. Every move restarts the clock. Pick the brightest place you have, then leave it alone — boring stability is what buds want.

Overwintering tropical hibiscus (the September job)

Tropical hibiscus starts sulking below about 10°C and is killed by frost, so move it indoors well before the first cold night — in most temperate regions that means September or early October. Before it comes in, hose the plant down, inspect the undersides of every leaf, and treat any whitefly or aphids you find; a warm living room turns a small outdoor infestation into a plague. You have two indoor options. Option one, warm and bright: your sunniest window in a room above 13°C, watering when the surface dries — the plant keeps some leaves and may even flower a little. Option two, cool and semi-dormant: a bright, frost-free garage or stairwell at 7–13°C, watering only enough to stop the pot drying out completely — the plant drops most leaves and rests. Both work; what kills hibiscus is a dark, hot room and a wet pot.

Warning: expect leaf drop in the first two or three weeks indoors, sometimes dramatic. It's the normal response to lower light, not a dying plant — keep care steady and new leaves will follow. Do not repot, feed, or hard-prune a plant that is busy adjusting.

Back outside in spring

In late winter, prune leggy growth back, repot if roots circle the pot, and resume fortnightly feeding as new shoots appear. Once all danger of frost has passed, reintroduce the plant to the outdoors gradually — a week of shade, then dappled light, then full sun — so the leaves don't scorch.

Not sure whether yours is the tropical or hardy kind, or what's chewing its leaves? Snap a photo in PlantMe — the app recognises 35,000+ plant classes with 93% top-3 accuracy and tells you exactly which hibiscus you own and how to treat what it finds.