image from ecophilies.com
All About Air Plants By Michael MacCaskey
Air Plant (Tillandsia variabilis)
Tillandsias, and other members of the Air Plant Database, do their best work up high. Travel in the southern United States, or Central and South America, and you see them living way up in the trees, sometimes covering entire branches like some kind of vegetative fur. But unlike the basketball star Mr. Jordan, who is simply able to reach great heights, these plants seem to live and grow in nothing but air.
In a sense, they do live on air. Though a few are terrestrial, most tillandsias are epiphytes, a two-bit word that means they use other plants for support. But, as opposed to parasitic plants such as mistletoe, they're respectable guests and don't steal nutrients from their hosts. They have roots, but these serve primarily to hold the plants in place. Tillandsias get all the moisture they need from fog or rainfall, and all the nutrients they need from the dust, leaves, and debris that collect around them.
Tillandsias are a genus of the bromeliad family, the best known of which is the pineapple. Of the approximately 2,000 species of bromeliads, 600 are tillandsias. The best-known tillandsia is Spanish moss (T. usneoides), which is a common sight hanging in lacy strands from live oaks and bald cypresses throughout the Gulf Coast region.
There are two main types of tillandsias, and it's easy to distinguish them: some are gray or mostly so, and some are green.
The gray kinds grow naturally in tropical forests where long droughts are common. Their gray leaves reflect sunlight, conserving moisture in the leaves and so helping the plants survive. Green-leaved tillandsias are native to rainy, humid tropical forests. You can grow either indoors, but our homes (and the care most gardeners give) more closely approximate the dry tropics than the humid tropics, so gray kinds are a better bet indoors.
As with most plants, imitating their natural environment is the best way to display tillandsias. That means attaching them to trees outdoors (if you live where winters are frostless, USDA Hardiness Zones 10 and 11), or on branches, driftwood, slabs of bark, or similar material indoors.
The key to establishing a tillandsia on a piece of wood is to secure it firmly in place until its roots can reach out to the tree or mount and attach themselves. You must take care that the plant is firmly secured and not wobbly. Use wire ties, narrow-gauge wire, monofilament fishing line, or adhesive, whichever you find easiest to use and best adapted to the plant and support you're using. Our favorite tool is hot glue. Tillandsia specialist Paul Isley, owner of Rainforest Flora in Los Angeles, uses a ready-to-use adhesive, Tilly Tacker. Don't use epoxy or petroleum-based glues; they may harm the plants.
Once you've selected the mounting material, experiment with different placements for your plants to see if you like the look. Don't situate plants in deep pockets where water will collect, and where light and air movement are blocked. Standing water around leaves causes the plant to rot. Trim long roots to make mounting easier. Small, stemless plants are easy to glue directly to the smooth surface of a branch. Narrow drill holes are also suitable for plants with particularly narrow bases, such as T. purpurea. In either case, apply hot glue or other adhesive directly onto the surface or in the hole of the mounting material, and put the plant into it. If you use hot glue, let the glue cool for 20 seconds or so before putting the plant into it.
Caring for Tillandsias
In winter, plants need bright light, good air circulation, and once-a-week watering. In summer, provide filtered bright light and more frequent watering, as well as monthly fertilizing with a liquid product at quarter-strength.
Your maintenance regime depends partly upon how you display your plants. If they're mounted or positioned so they're not easy to move, mist the plants with a spray bottle. If they are not attached to a mount, immerse the entire plant in water for up to 12 hours every other week or so.
In frost-free areas, tillandsias can grow outdoors all year. Start by attaching them to the branches of trees. They'll soon adapt, requiring no additional care, and will eventually spread.
Propagate tillandsias by separating offsets that are a third the size of the mother plant. Use a knife or pruning shears if they don't pull apart readily.
Michael MacCaskey is a former editorial director at National Gardening.
Taken from https://garden.org/learn/articles/view/765/?utm_source=nl&utm_medium=mail&utm_campaign=nl_2021-01-30
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