Anthurium plants, known for their striking, often heart-shaped leaves and vibrant, waxy “flowers” (actually modified leaves called spathes), often raise the question: are they better suited for indoor or outdoor environments? These tropical plants, native to Central and South American rainforests, have specific care requirements that dictate optimal placement. This guide clarifies where an anthurium will best thrive.
Anthurium as an Indoor Houseplant
Growing anthuriums indoors provides precise environmental control, mimicking their native tropical habitat. They thrive in bright, indirect light, ideally near an east or north-facing window. If near a south or west-facing window, diffuse direct sun with a sheer curtain, as direct light through glass can scorch foliage.
High humidity, 60% or higher, is crucial for indoor anthuriums. Achieve this by placing the plant on a pebble tray (ensuring the pot doesn’t sit in water), using a humidifier, or grouping plants to create a humid microclimate. Maintain warm temperatures between 65°F and 85°F, positioning the plant away from drafts and heating or cooling vents.
Water when the top inch or two of soil feels dry, usually weekly. Allow water to drain completely to prevent root rot, as anthuriums are sensitive to overly wet conditions. Use a well-draining potting mix, such as a 50-50 blend of orchid and houseplant media, or a mix rich in organic matter.
Anthurium as an Outdoor Garden Plant
Anthuriums thrive outdoors year-round in USDA Plant Hardiness Zones 10 to 12, where temperatures remain consistently warm and frost-free. Temperatures below 60°F can damage the plant, and prolonged exposure below 40°F can be fatal.
Outdoor placement requires shade or partial shade to protect the plant from harsh, direct sunlight. An ideal spot is often under a larger tree’s canopy, where light is filtered. While natural rainfall helps, outdoor anthuriums may need supplemental watering every two to three days, depending on evaporation rates.
Soil for outdoor anthuriums should be well-draining and enriched with organic matter to prevent waterlogging. Outdoors, plants are more susceptible to common garden pests like aphids, mealybugs, spider mites, thrips, and scale insects, requiring regular inspection. A sheltered spot is beneficial, as wind exposure can be detrimental to their broad leaves.
Factors Influencing Placement
Deciding whether to grow an anthurium indoors or outdoors depends on your local climate and environmental conditions. The primary determinant is your region’s USDA Plant Hardiness Zone; year-round outdoor cultivation is possible in Zone 10 or warmer. In colder zones, anthuriums must be brought indoors when temperatures drop below 60°F.
Consider available light: indoor spaces offer consistent bright, indirect light, while outdoor gardens have more varied patterns. Your time commitment also plays a role; indoor plants require active humidity management, while outdoor plants need vigilance for pests and weather changes.
Aesthetic goals also influence placement; you might prefer the plant as a decorative indoor element or part of a garden display. Your preference for managing indoor versus outdoor pests can also guide your decision. Both environments present unique challenges and advantages.
Transitioning Anthuriums Between Environments
In regions with seasonal temperature changes, transitioning anthuriums between indoor and outdoor environments is often necessary. Moving an anthurium, especially from indoors to outdoors, should be gradual to prevent shock. Slowly introduce the plant to new light and temperature conditions over one to two weeks, a process known as hardening off.
Before bringing an outdoor anthurium indoors for cooler months, thoroughly inspect for pests. Check leaf undersides and soil for insects or eggs to prevent introducing infestations to your indoor plant collection. This is also a good time to consider repotting or refreshing the soil. Gradual acclimation and pest vigilance ensure a smooth transition and the plant’s continued health.