"Cereoid-UR12-" wrote in message
om...
Exactly where on the planet are you?

Are you trying to grow them where they normally don't survive the winter?

Most Phormium cultivars cannot tolerate freezing temperatures.


They are reliably winter hardy to zone 8, 20F. Many of the hybrid cultivars
(with P. cookianum parentage) are somewhat hardier, specially if drainage is
very good. These originate from high mountainous, even alpine, areas of NZ
and can tolerate quite a lot of cold weather.

pam - gardengal