Stem hollow below cut flower
I'm a newbie to growing dahlias, and I just cut my first two flowers. They're from different plants, but on both of them the stem is hollow below the cut, even really close to a junction.
When I learned about pinching back/topping, I read that if the stem is hollow you should pinch back more until it isn't hollow so the plant isn't susceptible to rot. I certainly don't want my plants to rot, but If I cut any lower, I'll be taking unopened buds off which I would rather not do. Any advice? Thanks!