Risto Varanka wrote :

On Apr 27, 8:43*pm, "Jane_Galt" wrote:
What are good perennial bulbs for Colorado ( zone 4? ) , that can be
plan
ted
in spring, will bloom in summer, and spread each year?

Dahlias should fit the bill. One caveat is that you have to dig them
up for winter, or buy new tubers each spring. If you divide them after
digging up, you get an exponential growth in the number of plants each
year though.

Strong points of dahlias are that they bloom for months and months,
and offer great variety - there's thousands and thousands of very
different cultivars available. Just search for dahlias on
http://images.google.com/ to get an impression. Also, AFAIK there is a
rather active dahlia society in Colorado, which can be a big benefit
(or, at least you know somebody grows the flowers in your state... ).



Yeah they're gorgeous. I tried some a few years back and they were great, but
didn't dig them up & they died.

What about zone 4 perennial bulbs that can be planted in spring & bloom in
summer.

Arent Crocus Sativus that way here? And they yield the most expensive and
tasty spice in the world - saffron!