Enjoy the blooms from Endless Summer hydrangeas (Hydrangea macrophylla) throughout the season. Bigleaf hydrangea plants, such as Endless Summer, produce flowers on current stems as well as old stems, allowing it to grow through a longer season, up to six months in warmer climates. Flower heads appear blue in acidic soils and pink in alkaline. This type of hydrangea won't require pruning often. Typically, you'll just want to identify and prune dead wood.
Wait until spring to prune Endless Summer, when new growth buds start to emerge.
Prune only dead stems from Endless Summer plants. Watch for growth on the plant's base. If plant shoots are 6 to 8 inches long, but upper stems are bare, remove bare stems.
Clip off dead stems with a pair of clean, sharp garden shears. Prune up to the point on the stem where new growth appears.