December Flower of the Month

American Holly

Ilex opaca

The most widely recognized native holly is Ilex opaca, or American holly. Growing to 50 feet, the evergreen leaves have sharp-pointed tips and spiny-toothed margins. Pale trunks stand out in the landscape on single or multi-trunked specimens.

Yellowish white, small flowers bloom in spring and provide an early source of nectar for bees, ants, wasps, and night-flying moths. If the tree is a female and a male tree is nearby for pollination, bright red, orange, or sometimes yellow berries shine in the winter woods. These colorful berries are eaten by at least 18 species of birds, including many songbirds, mourning doves, wild turkeys, and northern bobwhite. Henry’s elfin butterfly and the striped hairstreak lay their eggs on American holly, for it is their larval plant. In addition, some mammals, including opossums and raccoons, eat holly berries. Cattle and deer have been known to browse the foliage.

Though the largest trees are found in rich, slightly acidic bottomlands, they are adapted to a wide variety of conditions. They can be found on sandhills, dry, gravely soils farther inland, or thin mountain soils up to an elevation of about 3,000 feet. Truly a plant for the humid Southeast, Ilex opaca is hardy in Zones 6 to 9 and grows in acid, rich or poor, wet, moist or dry soil. Salt tolerance makes it desirable for those who live near bodies of salt water or where salt-water intrusion is a problem.

In nature, native plants grow in plant communities or associations. American holly is at home under native canopy trees and in the company of musclewood, pawpaw, sourgum, flowering dogwood, blueberries and huckleberries, titi, redbay, sweetbay, and hawthorns. In home landscapes, they are best planted at the edge of woodlands or in a place where some protection is offered from the worst of summer’s sun. A naturally mulched area some distance from the house might be best. The spiny leaves carpet the ground under the trees and make walking barefoot under it an impossibility.

The ornamental value of this holly makes it a favorite for holiday decoration. Glossy, red berries and leathery, sturdy leaves make it outstanding in floral designs, wreaths, and other holiday accents. In most floral designer’s gardens, a holly can be found that is pruned each winter around Christmas time. 

Other Native Hollies 

Ilex opaca is not our only native holly. Deciduous holly natives include possum haw (I. decidua), Sarvis holly, (I. amelanchier) and winterberry or black alder (I. verticillata). Evergreen hollies include yaupon (I. vomitoria), gallberry (I. glabra), myrtle holly (I. myrtifolia), dahoon holly (I. cassine) and others.

To further add to the confusion, hybrids of I. opaca and I. cassine have been developed. This group contains some of our most useful landscape subjects, and includes such well-known names as ‘Savannah’, ‘Fosteri’, and ‘East Palatka’. One internet mail-order source (Windrose Nursery), lists 39 cultivars of American holly with sizes ranging from the one-foot ‘Maryland Dwarf’ to the 40 foot ‘Merry Christmas’. Wow! That’s a lot of choices – at least, I thought so until I looked in Dirr’s Manual of Woody Landscape Plants. According to Dirr, over 1000 named cultivars exist! 

With all of these selections, an American holly can surely be found that will perfectly fit your landscape. Dirr recommends choosing one of the superior cultivars instead of a seedling, and reminds us that a male is necessary among the females for good berry production. Select one of these adaptable trees for your landscape, and every day will be a holly-day!

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