Has anyone had any success in staking Annabelle Hydrangea’s? I have 10 plants in a grouping. Last summer (their second year) the plants looked like they were on steroids. 5′ tall with 12"-14" flower heads. Although I followed the advice on pruning and only cut them back to 18", the stems were not strong enough to hold up the flower heads. They fell over the hoop staking and never recovered their upright form. I’m thinking of those expandable willow cones that come in 36" or 48" height. Any advice would be most welcome!