Plant in full coastal sun to part sun or dappled shade in fairly well-drained soil with only occasional summer water. Hardy to around 20 F.

Thomasia grandiflora is a widespread species, mostly found in near-coastal locations growing in open forest in the south-west of Western Australia. This particular selected plant was collected from an area near Mount Lesueur (really a near-circular flat-topped mesa with an elevation of just over 1,000 feet) northeast of Jurien Bay. Mount Lesueur was named by Europeans in 1801 as the French ship, the Naturaliste sailed past Jurien Bay on its voyage up the Western Australian coast. It was named in honor of Charles Alexander Lesueur, a natural history artist on board the ship. The genus Thomasia honors Peter and Abraham Thomas, botanical collectors and the specific epithet grandiflora is from the Latin word 'grandis' meaning "large" or "great" and 'florus' - "to bloom" in reference to the large flowers of this species. This plant was introduced in 2010 through the through the University of California Santa Cruz Arboretum Koala Blooms Australian Plant Introduction Program. We sold this plant from 2010 until 2013 and only discontinued it because it was under appreciated and did not sell. 

This information about Thomasia grandiflora 'Mt Lesueur' displayed is based on research conducted in our horticultural library and from reliable online resources. We also will relate observations made about it as it grows in our nursery gardens and other gardens we have visited, as well how the crops have performed in containers in our nursery field. We will also incorporate comments that we receive from others and we welcome hearing from anyone with additional information, particularly if they can share any cultural information that would aid others in growing it.