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PlantSnap
Plant Care
Black-eyed susan
(Rudbeckia hirta pulcherrima)
Also Known As
Black-eyed susan, Susan, Gloriosa daisy
About This Plant
Rudbeckia hirta pulcherrima is a species of flowering plant in the family Asteraceae. It is an annual or biennial plant that typically grows to a height of 30-90 cm (12-36 inches) and produces yellow or orange-yellow daisy-like flowers with dark brown centers. The plant is native to North America and is commonly grown as an ornamental plant in gardens and landscapes.
Plant Care Instructions
Outdoor Size Range
Height of 30-90 cm (12-36 inches) and a spread of 30-45 cm (12-18 inches).
Light Requirements
Full sun to partial shade. Requires at least 6 hours of direct sunlight per day.
Humidity Needs
Does not require high humidity levels.
Fertilizing Schedule
Fertilize once a month during the growing season with a balanced fertilizer. Stop fertilizing in the fall to allow the plant to go dormant.
Pruning Guidelines
Deadhead spent flowers to encourage more blooms. Cut back the entire plant to the ground in the fall after the first frost.
Common Pests and Diseases
Black-eyed Susans are relatively pest-free but can be susceptible to powdery mildew if grown in humid conditions.
Indoor Size Range
Not suitable for indoor growth.
Watering Schedule
Moderate watering. The soil should be kept evenly moist but not waterlogged. Allow the top inch of soil to dry out between waterings.
Temperature Range
Prefers temperatures between 18-24°C (65-75°F). Can tolerate some frost but not extreme cold.
Growing Season
Summer
Growing Difficulty Level
Easy to grow. Suitable for beginner gardeners.
USDA Hardiness Zones
3-9
Did You Know?
The Black-eyed Susan is the state flower of Maryland.
