The Variegated Form of Costus Arabicus

The Name Game

• Botanists and taxonomists review the naming and traits of plants to ensure they are logically classified within their genus. Variegated spiral ginger was once listed under the scientific name Costus amazonicus, although now it is recognized as a cultivar of Costus arabicus. Despite its updated taxonomy, variegated spiral ginger is sometimes still sold in nurseries under its older scientific name.

Spiral Showstopper

• Standing 6 to 10 feet tall with a 4- to 8-foot spread, variegated spiral ginger dominates the landscape and will quickly overshadow other plants in smaller gardens. The leaves vary in color from snow white to cream or yellow with contrasting green stripes, and they possess a lanceolate, or spearhead, shape. Under ideal conditions, the plant produces a short stalk topped with 1-inch-long, shell-shaped flowers during the summer months. The flowers vary in color from cream to pure white, but are not particularly showy or fragrant.

Sunny Disposition

• Variegated spiral ginger relies on warmth and bright, diffused light to look and grow its best. Indoor-grown specimens must be positioned near a west- or east-facing window where they will receive bright light, but no direct sun at midday. If growing outdoors, plant variegated spiral ginger in a sheltered and lightly shaded bed with morning and afternoon sun. Avoid growing in dim conditions because the striking foliage variegation will fade. If possible, maintain ambient temperatures above 60 degrees Fahrenheit to encourage constant growth and reliable blooming.

Keep It Simple

• Under suitable growing conditions, variegated spiral ginger requires little hands-on care. However, it must be routinely watered and occasionally fed to encourage healthy foliage growth. Twice weekly watering is best, although it is important to allow the soil to dry out on the surface between waterings to prevent damage to the roots. Variegated spiral ginger is not grown for its flowers, so it can be fed with balanced fertilizer instead of bloom-specific fertilizer. Dissolve 1/4 teaspoon of 15-15-15 ratio fertilizer in 1 gallon of water, and replace one watering per week with the fertilizer solution. Reduce feeding to once monthly during the winter.

One Tough Cookie

• Variegated spiral ginger is relatively problem free. It resists insects and possesses a rugged, highly adaptable root system that will survive short periods of drought and flooding with minimal damage. However, the plant may develop crisp leaves with brown edges if exposed to hot, dry conditions for too long. While not life threatening, low humidity will impact the plant's appearance and may cause a decline in vigor if not corrected. Misting is the best means of raising humidity around indoor and outdoor variegated spiral gingers. Simply spray the stems and the tops and bottoms of the leaves with a fine mist of water twice daily during hot weather.