Once it stops flowering you stop watering.
http://gardenofeaden.blogspot.co.uk/200 ... nepal.htmlIt prefers a slightly acidic, humus rich and free-draining soil, so if you are planting outside add plenty of leaf mould and horticultural grit to your soil. Like clematis, the Lily of Nepal needs to keeps its roots in the shade while its head stays in either semi-shade or full sun so make sure that it gets a good top dressing of either gravel, ornamental or composted bark to keep the heat off the soil.
Garden of Eden for more Infomation.
I bought one bulb from De Jager just now....£6.50 but if my other De Jager Lily bulbs are anything to go by I shall be well pleased.
http://www.dejager.co.uk/_-Nepalense-_p ... ?pid=17290