"Fierycloud" in Taiwan wrote: >I always have a question that which commercial available varieties >and species would perennialize in which climate zone, but I just >can't find a comprehensive information. >Only some web-shop would marked some of their bulbs as vigor, >perennializing and naturalizing for the location where the shops are. I think it's not possible to predict this based only on climate. Many other factors affect how a bulbous plant can perennialize in one spot or another, including drainage, and especially the presence of predators and diseases. For example, some people in my own area say they cannot grow Narcissus because they always die. This may be caused by bulb fly, or perhaps by bad drainage. Yet my daffodils do well, and I hope they will also do well in my new garden. It has bad soil (too much clay), but I'll improve it before I plant anything, and most of the garden slopes. Some books will tell you that hyacinths are suitable only for annual bedding, but my old garden has hyacinths that have flowered in place for 20 years. Some bearded irises, particularly recent cultivars, do not perennialize effectively, but others, especially the oldest kinds, will take over an area even in competition with other plants (something most new cultivars can't tolerate). On the other hand, the soil and climate in the old garden are very suitable for crocuses, but there are so many voles there that I could never keep any except in turf, where in fact they self-sow (this is how many crocuses grow in nature). There are no voles at my new place, but there are introduced eastern American squirrels, which I'll have to control if I want crocuses outside the bulb house. In summary, it would be difficult for me to say what bulbs, other than Colchicum, "perennialize" in my own area, and it would be even more difficult for vendors to say, because most of them offer stock that's grown under very artificial conditions and never allowed to perennialize. The only advice I can offer is one of the best pieces of advice ever given to me: "Try everything." Jane McGary Northwestern Oregon, USA