Why some perennials won't bloom

[RuffeL]

In article <D3HMEv.C26 at UQuebec.CA>, Yvan_Roux at UQAR.UQUEBEC.CA () says:
>
>Some perennials (Astilbe is one of those) are
>very sensitive to spring frost. If they freeze
>in the spring, the plant is not losted and will
>grow leaves but it won't bloom. What happen exactly?
>
>Last summer some of my astilbes and heuchera did not bloom.
>

astible is very sensitive to the frost. what happens is the plant get push back. try usinn a bloom
boost ( fert) on them.  This will help out int he root system.