Perennial Obedient Plants (Physotegia virginiana) add a touch of pale purple to flowerbeds and landscapes. Mature height is approximately 4 feet, with flower spikes as long as 10 inches. Each plant spike produces four rows of downward facing tubular in white, pink and light purple colors. Obedient plants grow best in U.S. hardiness zones 3 through 10, making them popular in many flower gardens. Moist, well-drained soil, in partial to full sun, enables gardeners to grow Obedient plants in many different landscaping designs.
Place an Obedient plant in a partial to a sunny location. North or west sections of the property work best to keep the plant from receiving too much sunlight.
Grow companion plants that produce nectar near an Obedient plant to increase bee visitations for pollination. Asters, buttercups, poppies and geraniums are suitable companion plants for an Obedient plant.
Water weekly to prevent bottom leaves from yellowing and falling off the plant. Water with 1 to 2 inches of water or until the ground is wet, but not soggy.
Prune an Obedient plant often. Many areas consider it invasive because of its rapid growth. Pruning will reduce invasive properties without killing the plant.
Place a stake a few inches from an Obedient plant once it produces the spike for flowers. Loosely secure the spike to the stake with a tie. The stakes provide additional support for the plant to keep the flowering spike from breaking.
Apply a 1-inch layer of organic mulch to the base of an Obedient plant for soil moisture retention.