Bear's breeches are large perennial plants with glossy green leaves and tall spikes of flowers. They are wide plants and need at least 3 to 4 feet of garden space each as they like to spread out. These plants need full sun to partial shade and rich soil and are drought-resistant once established. Bloom time depends on your zone and the whims of the weather. Grows 3-6 ft tall, and 3-6 ft wide.