Propagation
Sow fresh seed during spring.
Divide established clumps (rhizome) during spring.

Botanic information
Leaf: The sessile dark green linear leaves may have serrulate margins.

Flower: The campanulate flowers have 5 petals and are arranged in a loose cyme that appears during summer.

Fruit: The capsule is obovoid and is surounded by the calyx lobes. The small seed is not commonly seen and the plant is normally reproduced vegetatively.