Can I grow "Texas hibiscus" as a perennial in zone 5 ( Nebraska).. will it handle the harsh winters like the hardy Lunas?...TIA
if you are talking about the Texas Star, I think they only survive hardiness zones 6 and up.
If you are talking about the Moy Grande Hibiscus, that will survive your zone. I have this one and it's beautiful:0)
Here is a link that might be useful: moy grande- Texas Giant Hibiscus