Rocky Maple Acer glabrum

A deciduous shrub or small shade tree with smooth bark in the Sapindaceae (soapberry) family.  Grows well in a woodland garden.  Glabrum means smooth, without hair, referring to its smooth stems and leaves. The species is named after David Douglas, a Scottish botanist who in addition to this tree, is also known for the Douglas fir.

Prefers dappled shade, moist soils, and protection from the wind.  Can withstand sandy, loamy, and heavy clay soils, prefers well-drained soil and needs lots of organic matter and a low pH (acid). It performs best in semi-shade (light woodland) to shade. It prefers moist soil. It will benefit from being planted in a location sheltered from strong winds, frost, and afternoon sun.

It is primarily grown for its ornamental red fruit in the late summer and fall, its interesting red twigs  that stand out particularly in the winter and its knock out yellow-to-red fall color.  This is a relatively low maintenance tree, and should only be pruned in summer after the leaves have fully developed, as it may 'bleed' sap if pruned in late winter or early spring.   Works well for erosion control.

Insects, Diseases, and Other Plant Problems: No significant insect or disease problems.  In alkaline soils, it can develop manganese chlorosis. Watch for aphids, leafhoppers, borers, scale, and caterpillars. Also note that verticillium wilt attacks the vascular system and can be fatal. Canker, fungal leaf spot, and root rots may also occur. Wind and ice may break some branches.

The Clemson Cooperative Extension Home and Garden Information Center has a factsheet on common maple diseases and insect pests.