As Jane indicates, there is no greater guarantee of a collection's continuance in a botanic garden versus another private collector. I have long argued that the natural vagaries of private collections are no more menacing than those of public gardens. New curators will have new priorities, as they should, and smaller plants (like bulbs) are especially impermanent features. What a person does with their more valuable plants over a period of decades is of far greater importance than what ultimately becomes of the collection. Propagation and careful distribution pay better dividends than any planned transfer. Dylan Hannon