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Curcuma 'Siam Splash Bicolour' (Siam Series)

A tropical perennial, with fleshy rhizomes, an upright habit and thin, lance-shaped green leaves with dark red midribs and pointed tips. Tiny, tubular flowers are encased in a cupped rosette of bracts at the end of flowering stems in summer; the upper bracts are bright pink with reddish purple tips

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

H1A

Botanical details

Family: Zingiberaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Columnar upright
Genus: A genus of herbaceous perennial plants, some of which have edible rhizomes used to produce turmeric and curcumin. The foliage is long, dark green and lush and sometimes plants produce tall spikes of angula flowers in shades of pink, purple or white
Name status: Unresolved

How to grow

Cultivation

Grow in a well-drained but moisture retentive potting mix, in indirect, bright light in a warm conservatory, greenhouse or windowsill, in temperatures no lower than 18°C (65°F). Although related to the species used to produce turmeric, ornamental cultivars like this are not suitable for consumption. See houseplant cultivation for further advice

Propagation

Propagate by division

Suggested planting locations and garden types

Houseplants
Low Maintenance
Conservatory and greenhouse

Pruning

Remove old, yellowed stems and spent flowers as necessary

Pests

Generally pest-free

Diseases

Generally disease-free

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.