Nature Field Guide
Spiral Ginger
- Spanish name
- Caña agria / Costus
- Scientific name
- Costus pulverulentus
What Do Pico & Tati Think?
Pico: “Spiraling leaves lead the eye to a red-orange cone of bracts.”
Tati: “Let’s notice the leaves, flowers and habitat without disturbing the plant.”
Species overview
About the Spiral Ginger
This native Costus grows as an herb with leaves arranged around the stem in a spiral. Its elongated reddish inflorescence contains overlapping bracts and narrow tubular flowers. Look for the small flowers rather than treating the whole cone as one blossom.
It occurs in humid forest and secondary growth. Several plants share the name caña agria, so that name alone cannot identify the species. Photograph leaf arrangement and flower shape, and do not taste a plant because of its common name.
Identification
Key Features of the Spiral Ginger
Leaves spiraling around a cane-like stem
Elongated red-orange bract cone
Narrow tubular flowers
Habitat & range
Humid Caribbean and northern forests, Guanacaste foothills, the Central Pacific and Osa.
Local observations
Native to Costa Rica. Local presence and abundance depend on suitable habitat and growing conditions.
When to observe
Leaves and growth form can be observed whenever the plant is accessible. Flowering and fruiting vary with location, weather and the individual plant; ask a local guide about current conditions.
Conservation & care
Explore with an adult on permitted paths. Observe and photograph without picking leaves, flowers or fruits. Do not taste plants or let pets chew them. Avoid climbing trees and disturbing roots, seedlings or visiting wildlife.
Threats & pressures
Protect suitable habitat, mature trees and natural regeneration. Avoid trampling, unauthorized clearing and collection.
Observation activity
Trace a spiral around a drawn stem and place the leaves along it.
Explore by location
Caribbean · Central Pacific · Guanacaste · Northern Plains · South Pacific · Guanacaste · Heredia · Limón · Puntarenas · San José