Let's Dance® Blue Jangles Hydrangea ShrubRich Blue Color + Reblooming Flowers Why Let's Dance Blue Jangles Hydrangea Shrubs? Blooms even after late spring frosts. Bred specifically to bloom on "new wood" (current season's growth) as well as "old wood" (last season's stems), Let's Dance Blue Jangles Hydrangea can be nipped by a late spring frost and still produce flowers later that same summer! This is an improvement over other bigleaf hydrangeas that form flower buds only on older growth.