Cryptocoryne crispatula, also known by its common name Water trumpet, is from the limestone mountains of Southern Thailand, where the water can be very hard. It is not very demanding but appreciates a nutritious substrate and good light. Like many other Cryptocorynes it needs to acclimatize before growth starts in earnest. Leaves become 20-60 cm long and the single roset plant becomes 15-20 cm wide. Place it in the rear part of the tank, from where the leaves may float beautifully on the water surface. The leaves are either entirely green or maroon.