How To Care For Old Wood Hydrangeas. Smooth hydrangeas do well in spaces that receive morning sun and afternoon shade and require consistently moist soil. Also be sure to sterilize your pruning shears before cutting.
Oakleaf hydrangea blooms on old wood. Prune the older growth from Oakleaf hydrangeas after the shrub blooms. Dont prune away stems that will bloom.
Sprinkle growmore on head of the dirt and include some fertilizer.
To keep the shrubs looking nice you can snip a few of the oldest or tallest stems near the soil line and clip off spent blooms just below the flower head. Prune off 13 of the old wood. To keep the shrubs looking nice you can snip a few of the oldest or tallest stems near the soil line and clip off spent blooms just below the flower head. Water everything quickly so it has the opportunity to douse down to the entirety of the roots.