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Costus dubius, the green grenade ginger, is a perennial, tropical, herbaceous plant from Africa. It grows from a rhizome, and has beehive type flowers that grow from the base of the plant. It can produce many flowers in spring and summer, and in good conditions these can form a carpet of flowers. It is not frost tolerant, so is good for tropical to sub-tropical areas, or frost free temperate cimates. It makes a good landscaping plant , as it has lush foliage. It can be grown as a large container plant.
Costus like free draining soils with plenty of organic matter. They like a part shaded position. Regular applications of fertiliser every 4-6 weeks, and regular watering will ensure good growth of the plant. Mulching of the plant will conserve soil moisture and will minimise weed competition.
Propagation is by division of the plant
Flower colour: white and yellow
Flowering season: spring summer
Maximum height: 2 metres
Minimum height: 1 metres
Maximum width: 2 metres
Minimum width: not specified
Will tolerate partial sunlight.
Light frost tolerance.
Plant is not salt tolerant.
This plant species will grow in the following climates: subtropical, tropical.
Loam: moist, well-drained.
Clay: moist, well-drained.
Soil pH: 6.0-6.5
Red spider mite
Planting season: Any.
Types of fertiliser: not specified.