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Cryptanthus rubin star, commonly known as Earth Star, is a type of bromeliad that can be grown both indoors and outdoors. While it is primarily an indoor plant, it can be grown outdie during summer months. Here are some care instructions for growing Cryptanthus rubin star outdoors in the UK:
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Location: Select a spot with partial shade or filtered sunlight. Cryptanthus rubin star prefers bright but indirect light. Avoid exposing the plant to direct sunlight, as it can scorch the leaves.
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Temperature: Cryptanthus rubin star prefers temperatures between 60°F (15°C) and 85°F (29°C). In the UK, it's important to protect the plant from frost during winter. If temperatures drop significantly, consider moving the plant indoors or provide appropriate frost protection.
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Watering: Water your Cryptanthus rubin star regularly, but avoid overwatering. The plant prefers slightly moist soil. During summer, water when the top inch of soil feels dry. In winter, reduce watering frequency as the plant enters a semi-dormant phase.
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Soil: Use a well-draining potting mix that retains some moisture. A mix of peat moss, perlite, and orchid bark or a commercial bromeliad mix can work well for Cryptanthus rubin star.
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Fertilization: Feed your plant with a diluted, balanced liquid fertilizer once a month during the growing season (spring and summer). Bromeliad-specific fertilizers are available, but a general-purpose houseplant fertilizer with balanced NPK ratios (such as 10-10-10) can also be used.
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Humidity: Cryptanthus rubin star appreciates higher humidity levels. In dry outdoor conditions, you can increase humidity by misting the plant occasionally or placing a tray filled with water and pebbles nearby.
