Hi there, I had a similar experience growing Becky Towe, it only lasted 3 years and third and final year it came up thin and weak did off soon after. I live in zone 5b and the plant tag grown by Hertiage Perennials states its hardy to zone 3. I have had success with Nora Leigh who I've enjoyed in my garden for at least 6 years now and is going strong still and every year comes up bushy and tall with lots of pale pink flowers. The leaves do occasionally get a bit of scorch in August sometimes on the edges where it is white. For the past couple of years on all my garden phloxes I have been getting attacked by spider mites, I spray water on the undersides of the leaves to discourage the mites from staying. Anybody else gets these mites? It causes the leaves to turn yellow and then brown, affects flower production if infested early in the season. Any other control methods? Thanks
