Let's Dance Big Band' combines bodaciously big mophead flowers with pure, true colors (pink in neutral/basic conditions, blue in acidic conditions) on a plant that survives winter better and reblooms better. That means more flowers, from the beginning of hydrangea season until the snowflakes fly! Pruning: big-leaf hydrangeas cannot be pruned at any point in the year without negatively impacting the flowering. As such, it's best to avoid pruning this type of hydrangea altogether. If portions of the plant were damaged from winter weather, they can be removed in spring when it is clear where the new growth is emerging.