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The purple berry-like growths that appear in oak trees aren't berries at all. They're oak galls, which the tree develops in response to being infested by certain kinds of small wasps. More »

One kind of plant that has purple berries is the pokeweed. This weed can be found growing along roadsides, in clearings and in open woods from Canada down to New England, south to Florida and west to Texas and Mexico. More »

Berries with a dark purple color include acai berries and purple chokeberries. Boysenberries, Indian plums, huckleberries and elderberries are other berries with a dark purple color. More »

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To identify oak trees using leaves, examine the leaf branching on the corresponding tree, determine if the leaf is simple or compound, and look for lobes on the leaf's edge. Also, check to see whether the lobes are point... More »

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Acorns, the seeds of oak trees, fall off their parent trees when they mature, which typically occurs between September and early November in the United States. The exact time of maturation varies slightly with different ... More »

Oak wilt, canker diseases, shoestring root rot, fungal infections and mildew diseases are some of the common diseases that affect southern live oak trees. Some of the diseases are fatal to the trees and can't be treated,... More »