Oakleaf Hydrangeas

By Dennis Pinkard, Master Gardener, President Lee County Gardeners Association and GHHA Board Member

Oakleaf Hydrangeas, Alabama's State Wildflower and one of two native species of hydrangeas in AL (the other is Smooth Hydrangea), is a hardy and resilient plant for southern landscapes.  It was discovered by John Bartram in 1791.  Because of its bold summer foliage, lacy flower clusters, fall color (the only hydrangea with fall color), and interesting exfoliating bark, Oakleaf Hydrangea is an excellent plant selection for a partial shade border.  It is a tough plant well suited as an under study plant below tall established widely spaced deciduous or pine trees.  At mature state health plants may reach eight feet in height and width. 

 Oakleaf Hydrangeas are relatively easy to grow and once established are hardy and beautiful plants that add immeasurably to a landscape.  Plant Oakleaf in well-drained soils containing organic matter.  They prefer morning sun and afternoon shade.  If planted close to trees, it will take considerable water to adequately moisten the plants.  Trees, already established, are better at water uptake and will out compete the Oakleaf for the available water.  Fall planting is the best time because roots can establish before it is time for blooms.  About one inch of water per week is necessary.  However, Oakleafs are generally not successful in soggy locations.

 Fertilize Oakleafs with a general purpose fertilizer, 12-4-8 or 10-10-10, in April and June, about a half pound per one hundred square feet each time.   Annually, soon after flowering (before August), perform general maintenance by removing all dead wood and remove a few older stems each year to improve plant vigor.

 Oakleaf Hydrangeas are especially rewarding and are pleasing throughout the year.  More information is available through the Alabama Cooperative Extension System, www.aces.edu, publication ANR-1276.

 Beware - deer will graze on Oakleaf Hydrangeas and they will need to be protected or planted in an area where deer do not frequent.

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