St. Johnswort - Hypericum
St. Johnswort (Hypericum calycinum, or Aaron's Beard) is a wonderful choice for hot, dry locations with poor soil. It is a vigorous grower that can be invasive (as I have found out), but can be useful to control erosion. These shrubs and perennials have long-blooming, bright yellow bushy flowers in the summer. They are evergreen in warmer climates and should be cut back to the ground every other year. Once established, these tough and resilient plants can stand neglect, drought and poor soils. Many make good seaside plants.
The low growing Hypericum calycinum is commonly grown as a ground cover and will grow 18 inches tall, and spread 15-24 inches. Shrubs can grow to 5 feet. They bloom mid summer to mid fall, and grow well in full sun or partial shade. St. Johnswort is a low maintenance plant that is sometimes bothered by Rust Spider or mites. It is hardy in zones 3-9.
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