Tillandsia cyanea (Syn. Wallisia cyanea)

The so-called air plants of the genus Tillandsia are true survivors. Most of them are epiphytes, meaning they grow as non-parasitic plants on trees and bushes, less commonly lithophytes, which grow directly on rocks. Their roots only serve to attach to the substrate, and some species do not form any roots at all. Tillandsia continue to grow normally even without roots and do not necessarily have to be on a substrate to survive. They can be kept free-hanging or mounted.

The leaves of Tillandsias are usually covered with modified hairs, known as trichomes. They are visible as a more or less dense, white fuzz on the leaves. They act like small sponges and become transparent when filled with water. These hairs allow the Tillandsia to stay moist longer and have more time to absorb water and nutrients before drying out again. Tillandsia are among the few plants that can absorb water and nutrients through their leaves.

Tillandsia can be roughly divided into two categories, which differ in their care:

• Tillandsia from arid regions usually have denser hair and are gray to white when dry. Their leaves are often narrow, and the entire plant is compact and firm.
• Tillandsia from humid habitats have few to no trichomes and are green when dry. Their leaves are often long and wide, and the plant is less compactly built.

As houseplants, Tillandsia from arid regions are particularly suitable. They can and should be dry most of the time and need a lot of light. Tillandsia from humid habitats are more suitable for care in a terrarium or plant display case.

This species originates from a more humid habitat than most other Tillandsia. It requires slightly less light than usual and can also be kept wetter. A spot by a west or east window with direct sun, but protected from harsh midday sun, is ideal.

When cared for under grow lights, it needs medium illumination. At 3,000 to 5,000 lux or 70 to 115 PPFD (µmol/m²/s), it grows well and the leaves develop their ideal color.

It prefers humidity of 60% or more. Although it comes from a humid habitat, ensure that the plant can always dry out before it is watered again.

It likes warmth. Temperatures of 25 to 30°C lead to the best growth. However, when completely dry, it can also surprisingly tolerate cool temperatures of 10 to 15°C without harm, although it will not grow at these temperatures and moisture can lead to rot.

This plant does not require a pot or substrate. It can be cultivated free-hanging or mounted. It can be attached to a cork branch, a root, a stone, or similar using plant glue or string.

Please also mount it without sphagnum moss so that the base of the plant can dry more easily.

Tillandsia are sprayed or soaked to provide water and fertilizer. They absorb water and nutrients directly through their leaves. A small hand sprayer is sufficient to care for a small collection of Tillandsia. For larger collections, purchasing a pressure sprayer is recommended.

Tillandsia prefer soft water and should therefore be sprayed with distilled water, rainwater, or water from an osmosis system. If they are sprayed with (hard) tap water, regular rinsing with soft water approximately every 4 weeks helps to prevent limescale buildup on the leaves.

This Tillandsia should always dry completely before being sprayed again. How often it needs to be sprayed depends on the temperature and sunlight. In summer and above 25°C, it can be sprayed daily; in winter and with low light, spraying once a week is sufficient.

Tillandsia are undemanding plants that don't need too much fertilizer. As houseplants, they can be fertilized during the growing season from approximately April to October with an orchid fertilizer approximately every 2 weeks. For this purpose, purchasing a second hand or pressure sprayer might be worthwhile to avoid constantly changing the water. We recommend halving the manufacturer's recommended dosage. This corresponds to a fertilizer conductivity of approximately 250 µS/cm. The conductivity can be determined with a TDS meter.

During the autumn and winter months, fertilization should be reduced, as the plants do not receive enough light to utilize the nutrients. A very weak fertilization of approximately 100 µS/cm monthly is sufficient here.

When cared for under grow lights, they can be fertilized year-round with approximately 250 µS/cm every 2 weeks.

If kept outdoors in summer, additional fertilization is usually not necessary, as Tillandsia, as in nature, obtains nutrients from rainwater and dust.