Aesculus pavia, Zones 4 to 8 Red buckeye features 6-to-8-inch tall, upright panicles of tubular flowers between April and May. Hummingbirds flock to the blooms, which cover the tree in a red blaze.

There are even flowering trees that hummingbirds visit ... of Agriculture Plant Hardiness Zones 4 through 8, red buckeye trees prefer a well-draining soil with a neutral pH between 6.0 and 8.0 ...