A terrarium is a delightful way of growing some species of bromeliads. Terrariums are see-thru containers enclosing plants in a relatively protected environment insuring that a great deal of vapor remains around each plant. Open and closed types can be constructed, but one with bromeliads should be at least partially opened as they need some fresh air at all times. Fish tanks or wide mouth vessels make the best bromeliad terrariums.
Most species of cryptanthus are reliable terrarium plants and when acclimatized they will thrive, flower, and reproduce faithfully. You can also grow some of the soft leaved moisture-loving species such as Vriesea glutinosa (until too large) and Nidularium innocentii because their native habitat is not unlike that of a terrarium. Catopsis nutans and Neoregelia ampul I ace a do well if their leaves are not constantly wet. Even Tillandsia ionantha, if mounted on a piece of driftwood, will sometimes grow lush and flower in a terrarium.
Construct your terrarium by filling the bottom with 1inch of gravel, and then covering this with 3-5 inches (7.5-12.5cm) of planting medium consisting of 1 part German peat and 1 part perlite. A few tablespoons full of activated charcoal may be added to the medium to help keep it “sweet”. Remove the plants from their pots and arrange them attractively. Use your imagination and mimic a jungle or woodland scene. Driftwood becomes a fallen log. Small rocks add a distinctive touch. Other plants such as small ferns can be included. A terrarium should never be in direct sunlight, but each day it should get several hours of good, bright light. Keep the planting medium lightly moist but never soggy. Add small amounts of water as needed and mist the plants occasionally. Tank-type bromeliads should have some water in their cups.
Mixed plantings
Bromeliads are beautiful alone or planted in clusters, but they are equally attractive as accent pieces mixed with other plants. A single container, on the tableor hanging, may be planted with a mixture of foliage and flowering plants that are compatible (similar light, watering, soil, temperature needs) with the bromeliads. Aechmeas, billbergias, and most terrestrial species are especially compatible with houseplants.