The ostrich fern thrives in wet soils and can reach heights up to 5 feet tall. It is hardy to -40 degrees Fahrenheit, the average low temperature in USDA plant hardiness zone 3. Gardeners often use ostrich ferns for thick ground cover in shady areas.
Problems
Ostrich ferns develop wide reaching rhizomes, or roots. This makes the fern more difficult to grow in pots or containers. For best results, use a container that holds a minimum of 10 gallons.
Moisture
The ostrich fern loves moist soil. Potted soil tends to dry out faster, so gardeners should check the soil's moisture level frequently and water whenever necessary. Layering the soil with organic mulch helps retain moisture.
Space
Container-bound ostrich ferns require 2 to 3 feet of open space on each side of the plant. This helps prevent fungus problems caused by excess moisture and limited airflow. Indoor fern plants benefit from placement near a window to allow them some filtered light in the mornings.
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