Costus pulverulentus

Conservatory Greenhouse

Rhizomatous, upright perennial about 2m tall, with large, dark green leaves, arranged in a spiral form, and tubular red to orange-red flowers with basal bracts, produced in dense terminal heads at any time of year

Position

Full shade, Partial shade

Soil Types

Loam

Max Height

1.5-2.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
1.5-2.5 metres

Growing Conditions

Loam
Moisture
Moist but well–drained
pH
Acid

Position

Full shade Partial shade
Aspect
East–facing or North–facing
Exposure
Sheltered
Hardiness
H1A

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Costaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Genus
Costus are rhizomatous perennials with spirally arranged leaves and tubular, 3-petalled flowers usually in terminal clusters on leafy shoots and often with showy bracts
Name Status
Correct
Plant Range
Mexico

How to Grow

Cultivation

Grow in a warm greenhouse or conservatory in a container or raised bed, using ericaceous potting compost, in bright indirect light, with high humidity. Water freely from spring to summer and use a general fertiliser monthly. Reduce watering in autumn and water sparingly in winter. Pot on or replant in spring. In humid tropical climates grow in a shady border

Propagation

Propagate by seed with heat, as soon as ripe, or by division in spring

Suggested planting locations and garden types

  • Sub-tropical
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to glasshouse red spider mite under glass

Diseases

Generally disease-free