Creating a captivating closed terrarium is a rewarding endeavor, bringing a miniature, self-sustaining ecosystem right into your home. The success and longevity of these enchanting glass worlds hinge significantly on one critical decision: choosing the best plants for closed terrariums. Unlike open terrariums, closed systems create a unique, high-humidity environment that demands specific plant characteristics to thrive. Understanding which plants are best suited for this particular habitat is the first step toward a beautiful and flourishing display.
This guide will help you navigate the selection process, ensuring you pick the ideal botanical inhabitants for your sealed glass sanctuary. We’ll explore the environmental factors at play and highlight specific species renowned for being the best plants for closed terrariums.
Understanding the Closed Terrarium Environment
Before diving into specific plant recommendations, it’s essential to grasp the unique conditions a closed terrarium offers. These sealed containers create a self-contained water cycle: moisture evaporates from the plants and soil, condenses on the glass, and then drips back down, watering the plants. This process results in consistently high humidity, stable temperatures, and limited air circulation.
Therefore, the best plants for closed terrariums must be species that:
Thrive in high humidity: Many tropical plants naturally adapt to these conditions.
Are slow-growing or dwarf varieties: To prevent them from outgrowing the container too quickly.
Prefer indirect light: Direct sunlight can quickly overheat the enclosed space.
Require minimal pruning: Less intervention means a more stable ecosystem.
Top Picks: Best Plants For Closed Terrariums
Based on these criteria, several plant families and species consistently prove to be the best plants for closed terrariums. Here are some excellent choices:
Fittonia (Nerve Plant)
Fittonia, with its striking variegated leaves in shades of green, red, pink, or white, is a terrarium favorite. These plants absolutely adore high humidity, making them perfect candidates for closed environments. They remain relatively small and offer a vibrant splash of color. When choosing Fittonia, look for compact varieties that won’t quickly overwhelm your space.
Peperomia Species
The vast genus Peperomia offers an incredible array of textures, colors, and leaf shapes, many of which are among the best plants for closed terrariums. Their compact size and preference for consistent moisture make them ideal. Some popular terrarium-friendly varieties include:
Peperomia caperata (Emerald Ripple Peperomia)
Peperomia clusiifolia ‘Jelly’ (Ginny Peperomia)
Peperomia obtusifolia (Baby Rubber Plant) – dwarf forms are best
These plants are generally slow-growing and tolerant of the closed terrarium’s humid conditions.
Ferns (Dwarf Varieties)
Many ferns are native to humid forest floors, making them naturally suited for closed terrariums. Their delicate fronds add a lush, jungle-like feel. However, scale is important; opt for smaller, slower-growing types. Excellent choices for the best plants for closed terrariums include:
Maidenhair Fern (Adiantum raddianum): Known for its airy, delicate foliage, it thrives in consistently high humidity.
Lemon Button Fern (Nephrolepis cordifolia ‘Duffii’): A compact fern with small, button-like leaflets and a slight citrusy scent.
Rabbit’s Foot Fern (Davallia fejeensis): Dwarf varieties can work, adding interesting fuzzy rhizomes.
Mosses
Mosses are arguably some of the most essential and best plants for closed terrariums. They thrive in constant moisture and provide a beautiful, verdant carpet that enhances the overall aesthetic. Mosses also help regulate humidity within the terrarium. Popular choices include:
Sheet Moss
Pillow Moss
Sphagnum Moss (often used as a substrate component)
Mood Moss
They require very little maintenance once established.
Selaginella (Spikemoss)
Despite their common name, Selaginella are not true mosses but ancient vascular plants resembling ferns. They are perfect for closed terrariums due to their absolute love for high humidity and their creeping or upright growth habits. Varieties like Selaginella kraussiana (Spreading Clubmoss) or Selaginella uncinata (Peacock Moss) are among the best plants for closed terrariums, adding fantastic texture and often iridescent color.
Dwarf Orchids (e.g., Jewel Orchid)
While most orchids are too large, certain dwarf varieties, especially Jewel Orchids (Macodes petola or Ludisia discolor), are exquisite additions. Jewel Orchids are grown more for their stunning, intricately veined foliage than their flowers. They appreciate the stable humidity of a closed terrarium and remain relatively compact, making them a unique choice for the best plants for closed terrariums.
Hypoestes (Polka Dot Plant)
Similar to Fittonia, Hypoestes offers vibrant splashes of color with its spotted leaves. While they can grow larger in open conditions, dwarf varieties or regular pruning can keep them suitable for closed terrariums. They enjoy the high humidity, making them a cheerful and colorful option.
Plants to Avoid in Closed Terrariums
Just as important as knowing the best plants for closed terrariums is knowing which ones to avoid. Generally, steer clear of:
Cacti and Succulents: They require dry conditions and excellent drainage, which is the opposite of a closed terrarium.
Large or Fast-Growing Plants: They will quickly outgrow the space and require constant pruning, disrupting the ecosystem.
Plants Requiring Direct Sunlight: The magnification effect of glass can quickly cook sun-loving plants in a closed environment.
Plants Prone to Fungal Issues: While many plants tolerate humidity, some are particularly susceptible to mold or rot in stagnant, moist air.
Maintaining Your Closed Terrarium
Once you’ve carefully selected the best plants for closed terrariums and assembled your miniature world, maintenance is surprisingly minimal. Place your terrarium in a spot with bright, indirect light. Monitor for excessive condensation; if the glass is constantly fogged, it might be too wet, and you may need to open it for a few hours. Conversely, if there’s no condensation, a small amount of distilled water might be needed. Prune only if a plant is pressing against the glass or showing signs of decline. The goal is to let the ecosystem find its balance.
Conclusion
Choosing the best plants for closed terrariums is the foundation for a flourishing and captivating miniature garden. By understanding the unique conditions of a sealed environment and selecting species that thrive in high humidity, indirect light, and remain compact, you can create a truly spectacular and long-lasting display. Embrace the beauty of these self-sustaining worlds and enjoy the tranquility they bring. Start planning your terrarium today and watch your chosen plants flourish in their new glass home!