06/09/2026
June Gift from the Garden
@ Nature Coast Botanical Garden - Florida Native Plant Demonstration Garden
Oakleaf Hydrangea or Graybeard (Hydrangea quercifolia)
By Janet Grabowski
As we progress into summer, the oakleaf hydrangea plants just to the west of the Shade Garden have been putting on a floral display. Its flowers are held in pyramidal clusters (panicles) that are up to 12 inches long and 4 inches wide on the top of the branches. The panicles are made up of both showy sterile and fertile flowers. The pinwheel-like sterile flowers have four rounded sepals that emerge white and gradually turn pink or purple and finally tan or light brown. The smaller fertile flowers are bisexual. They have five tiny petals that are white or yellowish in color and they shed early. The persistent greenish sepals are roughly triangular in shape. The fruit is a capsule that is about 3 mm wide and long and has 8 to 10 ribs. The capsules can remain on the plant through winter. The small (less than 1 mm long) seeds are brown, curved and ribbed.
As far as its ornamental appeal in the landscape, oakleaf hydrangea is no one-trick pony. Yes, the flowers are gorgeous; however, this plant’s foliage is also striking. The opposite leaves have a 1 to 2.5 inch long, hairy, brownish to red colored petiole and an egg-shaped blade that has 3 to 7 lobes, resembling an oak (Quercus) leaf, providing both the common and scientific names for this species. The leaves have saw-toothed (serrate) edges, except between the lobes where the margins are entire. The leaf blades are typically 3 to 8 inches long (can be up to 12 inches long on some specimens) and 2 to 6 inches wide. The upper surface of the leaf is medium to dark green and covered with fuzzy hairs when young, becoming smooth with age; the underside of the leaf is a lighter green color and covered with white to brown colored fuzzy hairs. The leaves are deciduous and will turn red, burgundy or purple before they shed.
Oakleaf hydrangeas are slow-growing shrubs with sturdy, upright branches, forming an open, rounded crown. These plants can grow 6 to 10 feet in height and spread to 3 to 8 feet in width by means of suckers from the root system. The twigs are densely hairy. Older branches have a brown papery bark, which peels to expose a lighter-colored inner bark. The exfoliating stems are quite attractive in the winter after the leaves fall.
Oakleaf hydrangea is a member of the Hydrangea Family (Hydrangeaceae). It was formerly in the Saxifrage Family (Saxifragaceae), until modern genetic testing showed that hydrangeas were not closely related to the other members of that family. In Florida, oakleaf hydrangea plants can be found growing in slope forests in bluffs, ravines, and along stream banks. According to the Florida Plant Atlas, it has been vouchered in the Panhandle and north central Florida, with a disjunct population in Marion County.
South of its native range, such as here in Hernando County, oakleaf hydrangea plants require protection from exposure to bright sunlight and will likely require supplemental irrigation in the dry season. Oakleaf hydrangea plants prefer to grow on a rich, acid loam soil, but will tolerate sandier soils. These plants will not tolerate poorly drained sites. Several cultivars of oakleaf hydrangea are available in the nursery trade. The foliage is moderately toxic and has caused restlessness and gastrointestinal problems in cows and horses that have consumed these plants.
Further information about Oakleaf Hydrangea can be found at these sites:
Florida Native Plant Society - ttps://www.fnps.org/plant/hydrangea-quercifolia .tab=0
FPS-259/FP259 – Ask IFAS - https://ask.ifas.ufl.edu/publication/FP259
North Carolina Extension Gardener Plant Toolbox - https://plants.ces.ncsu.edu/plants/hydrangea-quercifolia/
