Platanthera bifolia is a perential growing to 0.5 m (1ft 8in). It is hardy to zone (UK) 6. It is in flower from May to July. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. The Lesser and Greater Butterfly Orchids are very difficult to tell apart being similar in size despite their common names which would suggest otherwise. Growing to between 20-30cm tall this orchid has two narrow leaves at the base of the plant with several more small bract-like leaves higher up the stem. The inflorescence is cylindrical when full open and each one carries up to 25 flower.