I read somewhere that pennies help to keep hydrangeas blue. In other projects, I’ve seen people use bowling balls. I couldn’t find one, so I used a ball and chain kids toy I found at the thrift store.
I used some marine adhesive called Goop to glue the pennies on. It’s supposed to put up with rain and sun longer than most. Just spread the glue on and stick the pennies. You’ll have to do it in batches to keep them on there.
Once it’s dry, in my case 72 hours, put it next to your plant.
My hydrangeas are still dormant from winter, but the tulips have started to come up…