I have almost killed all of my wave petunias after 8 or 9 years! I finally have gotten rid of 95% with brush killer.
Wave Petunia invasion!
If we want them here in ILL we have to buy them every year. Wish there was a happy medium.
Hm. I had a volunteer this year of what looks to be a Wave. And I have never bought them, but had planted nursery pansies there last few years each fall.
I thought I had it all killed but I now have 1 spot where it is coming back !!!!!
Keep at it Astrablue. You'll get it someday.
It's always something, just a different something depending on where we're located. I'm having my annual battle hacking back my ginormous butterfly bush, and that stinking fig tree. Yet others pay good money for these things and baby them. They have no sympathy for me. LOL
Good luck to you. :)