what is the minimum temp a helichrysuum can survive?

Answer 1

Helichrysum,the everlasying flower, comes in two groups,hardy and tender. The hardy type can be sewn outside in April, so get a move on with these. They can be left to overwinter and spilt them in Spring for more plants. The tender types should be grown indoors and planted out when all danger of frost has gone.
Hope this helps

Answer 2

Here is info on growing this plant.

http://www.ecke.com/datasheets/ff_ffx_helich.html