Endless Summer, the trademarked name of the Bailmer cultivar of hydrangea, arrived on the market in 2004. This deciduous shrub produces blooms on both old and new wood, unlike other mophead varieties that only produce blooms on old wood (last summer's growth). Endless Summer's blooms will display blue when planted in acidic soil, or pink in alkaline soil. This amazing and popular shrub can flourish is USDA hardiness zones 4 through 9. Plant outside in late spring.
Evaluate your landscape for the best location to plant Endless Summer. The shrub can soften the sharpness of your landscape when planted at the corner of a structure. Endless Summer is capable of reaching a height and width of 5 feet. If allowing the shrub to grow unpruned, choose a location that can accommodate its growth potential. The best location will have moist, well-drained soil; however, Endless Summer can handle less moist soil. The location should be in partial shade or full sun with afternoon shade.
Dig the hole two to three times as wide as the root ball and one and half to two times as deep. As you remove the dirt, place it on a tarp on in a wheelbarrow to facilitate amendment of the soil.
Mix a slow-release fertilizer into the removed soil according to manufacturer's instructions. About 25 percent organic matter (such as compost, leaf mold or grass clippings) can be used in addition to or instead of slow release fertilizer. If working in clay soil, add about 50 percent organic to help loosen the soil for easier root growth.
Partially backfill the hole with the amended soil. Place the root ball or potted plant into the hole to check the level. The top of the root ball or the top of the dirt in the potted plant should be at ground level. Add or remove dirt from the bottom if needed.
Place the root ball or shrub removed from pot into the center of the hole and back fill the sides of the hole. When the hole is half full, remove the twine or wire holding the wrap to the root ball (for non-potted shrub) and pull the wrap halfway down the side of the root ball. Water the area around the root ball to settle the soil, and then finish backfilling the hole.
Water slowly around the area where the sides of the root ball would be. Keep the soil moist until full dormancy or about December.