Pruning hibiscus: when and how, by type or situation

You prune hibiscus in spring. Prune garden hibiscus (Hibiscus syriacus) in March: it flowers on this year's wood. Remove dead wood and weak shoots, cut back long, thin shoots to 30 to 40 cm, or cut all branches back to 40 to 60 cm if the shrub needs to stay compact. Remove at most a quarter of the oldest, thick branches per year. Prune Chinese hibiscus in a pot (Hibiscus rosa-sinensis) also in spring, before it goes outside again: long stems go back to 30 to 40 cm.

Pruning hibiscus by type or situation: the table

Which hibiscus do you have?

When it comes to "pruning hibiscus", it almost always concerns one of two plants. The garden hibiscus or rose of Sharon (Hibiscus syriacus) is a hardy shrub that stays in the garden and flowers from July to October. The Chinese hibiscus (Hibiscus rosa-sinensis) is a tropical plant with large, glossy flowers that cannot tolerate frost: it grows in a pot and overwinters indoors. A third species, the swamp hibiscus (Hibiscus moscheutos), falls outside this article. If your hibiscus stays outside in the ground all year, it is a garden hibiscus.

Garden hibiscus: the annual prune in March

Garden hibiscus flowers on new wood. What you prune in March grows into shoots that bear flowers the same summer. First remove dead, grey and frozen wood back to healthy wood, then the thin shoots, thinner than a pencil, and branches that cross. Shorten long, thin shoots to 30 to 40 cm, always at an angle and just above an outward-facing bud. The full explanation is in pruning garden hibiscus (Hibiscus syriacus).

Keeping garden hibiscus compact

If the shrub grows too large for its spot, you may prune more firmly in March: cut all branches back to 40 to 60 cm. Garden hibiscus tolerates this well because it flowers on new wood. Strong growers tolerate more than fine, weaker-growing cultivars; with the latter, stick to removing dead wood and thinning out.

Potted hibiscus: February, March or April

Prune a Chinese hibiscus in a pot in spring, before growth starts and before it goes outside again. Our two pot guides differ by a month here: pruning potted hibiscus says February or March, pruning Chinese hibiscus in pot March or April. March fits both. Shorten long, thin shoots, just above a bud, and remove branches that grow inwards. Long stems with few side branches go back to 30 to 40 cm for a small specimen, 60 to 80 cm for a large one. From May to September, only remove dead parts and an overly long twig.

After flowering and before bringing inside

After flowering, you may lightly trim a potted hibiscus: dead wood and a few shoots that have grown out. Do this in September. The guide on Chinese hibiscus advises against pruning in October and November, so from October onwards leave it alone and save the real pruning session for spring. Tropical container plants such as hibiscus go indoors according to bringing container plants inside between late September and mid-October, as soon as the nights drop below 10 degrees.

Old and neglected

A garden hibiscus that has not been pruned for years becomes large and untidy and flowers mainly at the tips. Prune it back hard in March, to about 50 cm, but never completely to the ground. Remove at most a quarter of the oldest, thick branches per year. Cut back a long, bare potted hibiscus in February or March to 30 to 40 cm.

Not sure where a garden hibiscus looks best? With a garden design you can see in a photo of your own garden how it fits with the rest of the planting.

Step-by-step plan

Step 1: Choose the moment

Prune a garden hibiscus in March. Prune a potted hibiscus in spring, before it goes outside; March works for both.

Step 2: Remove dead and frozen wood

Cut back grey, brittle and frozen branches to healthy brown or green wood.

Step 3: Thin out

Remove branches that cross, grow inwards or are thinner than a pencil. This allows light and air into the shrub.

Step 4: Prune back to the size you want

For a garden hibiscus, shorten long, thin shoots to 30 to 40 cm, or cut all branches back to 40 to 60 cm for a compact shrub. Always prune at an angle and just above an outward-facing bud.

Step 5: Give water and compost

After pruning, give a garden hibiscus a layer of compost of 2 to 3 cm and water during dry periods. A potted hibiscus receives regular water and feeding again from spring onwards.