Psoralea is a genus of herbaceous plants including shrubs and small trees, and belongs to the legume family.
P.aculeatus is a shrub growing 2-3 feet tall and has blue or white flowers.
P.affinis, below, is a shrub or small tree that grows much larger to around 10 feet with blue and purple flowers.
They should be planted in a greenhouse with winter temperature of no less than 7oC. They can also be cultivated in pots, make sure they are well-drained and planted in sandy compost.