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How to grow hibiscus

Add a tropical pop of colour to your garden. - by Better Homes and Gardens
  • 04 Nov 2020

The showy blooms of hibiscus take centre stage from late spring and continue to flower right through autumn. Each blossom lasts about 24 hours, with new ones flowering the next day.

WATCH: Graham creates his own bromeliad project

At a glance hibiscus may look delicate, but they’re tough! With warm weather and regular attention, they will add a ray of sunshine to your garden. 

How to grow 

Climate

Evergreen varieties of hibiscus will grow in tropical to warm-temperate climates, provided the area is free of frost. Deciduous forms, such as Hibiscus syriacus, will also grow in cool-temperate and frosty climates. Hibiscuses can be planted at any time of year, but it’s best to plant deciduous forms during autumn, so they have time to establish their roots before winter sets in.

Aspect

These gems are sun lovers, so plant in full sun and protect from strong winds.

hibiscus pink
Getty

Soil

Hibiscuses grow best in well-drained, slightly acidic (pH 6-6.5) soil. The one exception is H. syriacus, which is tolerant of alkaline soils. Before planting, ensure you improve the soil with well-rotted compost or manure.

Water

During the growing season, water regularly, and ensure drainage is good. Mulch the surrounding area with organic mulch, straw, hay or sugarcane, ensuring it doesn’t touch the stem. This will help keep the roots cool and moist in summer.

Feed

These plants respond well to fertiliser. Choose one that encourages blooms, and is high in nitrogen and potassium. You can also add a fish emulsion or seaweed extract to this feeding mix. Apply before and throughout the growing season (August through to March) as this will help intensify bloom colour and promote healthy growth.

hibiscus dangling
Getty

Pests

Check plants for the hibiscus flower beetle. These tiny black insects burrow their way through flower buds and foliage, leaving gaping holes. Use a systemic insecticide to help control infestations.

Maintenance

The best time to prune evergreen types is at the start of the growing season or when the last frost has passed – usually in September. They flower on new season wood, as do the deciduous types, which should be pruned in winter.

hibiscus yellow
Getty

Where to plant hibiscus in your garden

Plant these tropical gems and you’ll be rewarded with blooms that burst onto the scene in spring and flower right into the cooler months of the year. You won’t be disappointed!

Backyard

  • Put on a show of colour in your backyard with these bright beauties – the fiery red and orange combo will be a hit!
  • For a feature plant that will really turn heads, look no further than the coral hibiscus (H. schizopetalus). Its pretty parachute-like blooms will light up your landscape in glorious shades of red or pink.
  • Make a great addition to tropical and resort-style gardens and with its lush foliage, looks great even when not in flower.
  • For those with a pool, they look are perfect as poolside plant.
  • Can be pruned into a hedge.

In pots

Hibiscus will happily grace a garden of any style, including formal. Just train into a standard, plant in a large pot and wait for the flowers to shine. If they are quite big, you might need to stake them.

For the smaller varieties, they too make an excellent potted plant. Plant them up with an acidic potting mix to improve soil and promote growth.

hibiscus with its huge colourful flowers
Getty

How to prune hibiscus

Depending on the variety, pruning requirements are quite different, so keep the original label. If left unpruned, hibiscus shrubs will become scraggy and shapeless, with fewer flowers and smaller, duller blooms. A regular prune is the best way to help rejuvenate tired-looking plants.

As a general rule, remove any weak, dead or diseased wood including branches that are growing toward the centre. Trim back last season's growth and shape the bush into an ideal size as you go. Each cut should be just above a bud a third of the way back, making sure at least two to three nodes on the branches remain to encourage new growth. Aim for these cuts to be made just above the nodes, leaving about half a centimetre. 

For bigger branches, a lopper or saw may be required. But for smaller plants, shears that are sharp and clean will do. Overall aim for a good clean using freshly cleaned tools to reduce potential disease spreading from affected branches.

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