Curcuma alismatifolia

Growing in Pots, Balconies & Indoors

The Siam tulip (Curcuma alismatifolia) is a tropical rhizome (0.5-1.5 m / 20-60 in) grown for its long-lasting pink bracts. The grower lists it as suitable indoors, and since it prefers half to full shade it adapts well to bright indoor light; it also makes a superb container plant for a warm, shaded patio or balcony.

Quick Details

• Container Size: A medium pot with room for the rhizomes; give depth for the fleshy roots
• Indoor Suitability: A good houseplant in bright, indirect light
• Best Spot: Half shade to full shade – avoid strong direct sun
• Soil & Drainage: Rich, moisture-retentive but well-drained potting mix
• Watering in Pots: Average to plenty while in growth; keep it moist but free-draining

Indoors & On the Windowsill

• Houseplant use: The grower confirms it indoors. Give it bright, indirect light and warmth; it flowers through the warm season and makes a striking pot plant.
• Seasonal dormancy: It naturally dies down and rests in the cool season – reduce watering as the foliage fades and keep the rhizomes barely moist and warm until they reshoot; don’t mistake dormancy for death.
• Overwintering: Tender – through the cool dormant period keep the pot warm and dryish indoors; resume watering when new shoots appear.

On a Balcony or Patio

• Light & warmth: A warm, sheltered, part-shaded balcony or patio suits it; keep it out of hot direct sun and cold winds. Move it under cover as temperatures fall in autumn.
• Practicalities: Keep the mix moist in the growing season and freely draining so the rhizomes never rot.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A medium pot with strong drainage holes; skip a standing-water saucer to protect the rhizomes from rot.
• Potting mix: Rich, moisture-retentive but free-draining – potting mix with organic matter.
• Feeding: Potted plants exhaust and leach nutrients faster than those in the ground, so feed lightly during active growth – more often than you would in open soil. Feed through the growing season and stop as it goes dormant.
• Repotting: Refresh the mix and divide congested rhizomes every couple of years, ideally at the start of the growing season.

Bloom & Flower Guide

Quick Details

• Bloom Season: Summer
• Flower Appearance: Showy pink, white or purple bracts topping a spike, with small true flowers tucked among green lower bracts that stack like a beehive
• Edibility: Grown as an ornamental and long-lasting cut flower; treat the blooms as ornamental rather than a food.

Detailed Blooming Overview

The Siam tulip is really a ginger relative, and its flower is mostly colourful bracts. A tall spike carries a crown of pink, white or purple upper bracts, while the green lower bracts overlap like the cells of a beehive, and the small, short-lived true flowers peek out from between them through summer.

Flower Characteristics

• Bright upper bracts in pink, white or purple.
• Green lower bracts stacked in a beehive-like pattern.
• Small true flowers hidden among the bracts.

Bloom Care & Thinning

• Encouraging flowers: Warmth and steady moisture through the growing season bring the best spikes, followed by a cool, dry dormancy to reset the plant.
• Pollination: Bees and birds visit the flowers; the long-lasting bracts also make it a fine cut flower.