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last updated Nov 1, 2012
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Bananas

Bananas (Musa and Ensete spp.) produce large, elegant leaves and the occasional bunch of fruits, which certainly make a majestic addition to any garden or conservatory. Although they are tender plants, some species are hardy enough to leave outside over winter, especially in the milder parts of the UK, so they are worth experimenting with in the garden.

Cultivation notes Back to top

Growing outdoors

Choose a sheltered site, with the site sloping away slightly from the plant to avoid creating a frost pocket. Shelter from the wind is also essential to prevent leaves being shredded.

Plant in late spring, in a well-drained soil, enriched with organic matter (such as garden compost). Once plants are established, water and feed generously to get the best foliage.

Hardier species, such as Musa basjoo, can be left in situ over winter, and it is generally recommended to wrap plants to protect from cold weather. Although this is something you can experiment with in your garden. See our advice in overwintering tender plants: wrapping for further information, and step-by-step instructions on wrapping a banana.

Growing in containers (for outdoors or conservatories)

Smaller banana species make ideal container plants, which can be placed outdoors for the summer and brought indoors over winter. Grow in a loam-based compost, such as John Innes No. 3 with extra grit (30 percent by volume).

Container-grown plants need ample watering during spring and summer months. Feed at weekly intervals during the spring and summer with a general-purpose liquid feed, or mix a controlled-release fertiliser into compost when potting.

In autumn, reduce watering and feeding, watering only when on the dry side in winter.

Tender plants should be brought in when temperatures fall below 14ºC (57ºF) and overwintered in a frost-free greenhouse or conservatory.

Pot on in spring once a year, or every other year. Size and vigour increases with size of container. Increase pot size by 5-7.5cm (2-3in) initially. Once established in 30cm (10in) pots, increase size by 10-15cm (4-6 inches) every two to three years.

Fruiting

Garden plants are usually grown for their ornamental foliage. Some, however, have ornamental flowers and (mostly inedible) fruits. In a conservatory or greenhouse, Musa lasiocarpa, M. ornata, M. veluntina, M. acuminata ‘Dwarf Cavendish’, ‘Orinoco’ and ‘Rajapuri’, are likely to flower and may fruit once established. They may also successfully flower outdoors in favoured locations.

Bananas need a long and sunny growing period of some nine to 15 months, with temperatures above 15°C (60ºF) to fruit, with an optimum temperature of 27°C (81ºF), followed by a further two to four months for the fruit to ripen. Feeding with a high-potassium fertiliser may help.

Pruning and training Back to top

Little pruning and training is needed. Just cut away old leaves near their base and, when wrapping up plants outdoors for winter, some stems will need to be cut back.

Propagation Back to top

You can propagate by sowing seed or dividing plants. Seed is the best method for Ensete species as they do not produce suckers for dividing.

Seed

  • File one side of the seeds lightly and soak in warm water for 24 hours
  • Sow individually, 1cm (3/8in) deep, in pots of seed compost
  • Place in a warm location, at a temperature of 21-24ºC (70-75ºF). Germination of fresh seed is quick, but older seed can take up to six months
  • Gradually move seedlings into more light and increase watering and feeding to encourage growth

Division

Most Musa species produce offsets or suckers, which may develop into fruiting stems under suitable conditions. They may also have to be thinned every few years to prevent crowding in the clump. In spring, dig down to the rhizome and detach the sucker carefully, with as many roots as possible. Remove some of the lower leaves and pot in a container just large enough to take them.

Cultivar Selection Back to top

For outdoors, with winter protection:

Musa basjoo AGM: Often grown permanently outdoors in sheltered gardens in milder parts of the country, although it has been known to survive in sheltered northerly gardens. Height 3-4.5m (10-14ft).
Musa × paradisiaca ‘Rajapuri’: Deep green leaves and may produce edible fruits. Quite hardy and wind-resistant.  Height 2.4m (8ft).
Musa sikkimensis: Bronze markings on the young leaves and trunk. The foliage is fairly wind-resistant. Height 3-4m (10-13ft).

For cool conservatories or overwintered in frost-free greenhouses:

Musa acuminata ‘Dwarf Cavendish’ AGM: Large leaves, sometimes marked red. Height under 2m (6½ft).
Musa acuminata ‘Zebrina’ AGM: Grown for its red-striped foliage. Suitable for container cultivation. Height 2.4m (8ft).
Musa balbisiana: Attractive bluish-green leaves. Height 4m (13ft).
Musa itinerans ‘Yunnan’: Slender stems and wide arching, blue-green leaves. Height 2-3m (6½-10ft).
Musa lasiocarpa: Glaucous-green foliage, produces flowers but rarely the small, inedible fruits. Height: about 1.5m (5ft).
Musa × paradisiaca ‘Orinoco’: Hardy down as low as -1ºC (30ºF), producing edible fruit when grown in a conservatory. Height 4m (13ft).

For warm conservatories:

Musa ornata AGM: Attractive flowers and may produce inedible fruits.  Height 2-3m (6½-10ft).
Musa velutina AGM: Needs a minimum temperature of 16ºC (60ºF), may produce orange-yellow flowers and bright pink fruits. Height 2m (6½ft).

Links

RHS Plant Finder
RHS Plant Selector
AGM Plants

Problems Back to top

Leaves will naturally shred in exposed situations. This is an adaptation to tropical storms and does no harm, but foliage is more attractive in sheltered positions. Limp and hanging leaves may result from under- or over-watering.  Check the roots and increase or decrease watering as necessary. Brown edges suggest a lack of water or humidity. Cold, sun scorch and hail also damage foliage.

Die-back of the crown is usually due to cold damage, but may also be due to rot encouraged by excessive moisture.

Take care to avoid lush growth in young seedlings of hardier varieties during the winter, as this makes them more susceptible to disease.

Common pests include mealybug and red spider mite.

Quick facts

Common name Banana
Latin name Musa and Ensete
Group Tender plants
Flowering time All year round, but often at the end of a long summer in the UK.
Planting time Spring to autumn
Height and spread Up to 4m (13ft) in cultivation
Aspect Sunny
Hardiness Tender
Difficulty Moderate

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