Gardeners provide what amounts to evolutionary opportunities for plants. The red horse-chestnut, seen here, is a horticultural hybrid of red buckeye (A. pavia) and the European horse-chestnut (A. hippocastanum). It has now been found wild in Kentucky. Many horticultural varieties (cultivars in the lingo) like this one remain rarities. Others seize their opportunity with great enthusiasm. Lonicera x bella, a bushy honeysuckle, is one example. It is now found throughout the northeast, and in other states and provinces across the continent.