Propagation
Division of the clump during spring and maintain a humid warm environment. 

Botanic information
Leaf: The elliptical leaves have an upper undulating surface that is dark green with olive green areas on either side of the mid-rib and the margin. The underside is reddish and the slender, stiff petiole is up to 300mm (1ft) long. 

Flower: The erect spike is up to 100mm (4in) long consisting of sheathed bracts from which the tiny 3-lipped purplish tubulate flowers appear in the openings. The inflorescence is born amongst the leaves on a tall scape during early summer.

Fruit: The tiny frut is a 3-celled capsule and the small seeds are viable but the plant is commonly reproduced vegetatively. The flowering and fruiting period may vary in tropical regions.

Calathea species
This plant require an average temperature of 10ºC (50ºF) to 15.5ºC (60ºF) avoiding sudden variations in temperature. They prefer a humid environment and respond to regular misting of the leaves. 

When grown indoor place in a position with bright indirect light as the colours in the leaves fades in direct light. 
Keep the soil moist not wet and use tepid soft water, reducing during the winter period.

If the plant forms brown and dry stunted growth it normally is the result of the air being too dry.
Excessive moist soils will cause rot at the base of the plant.