Plant, Bromeliad 4"

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In general, bromeliads need a fairly specific set of conditions to bloom—and these conditions vary from genus to genus, and even from species to species in a single genus. Their bloom cycle is affected by day length, temperature, humidity, water, and feeding. You will need to research specific genera and species to determine how best to grow them.

When cultivated as indoor plants, most bromeliads—both epiphytic and terrestrial species—are usually planted in a mixture of potting soil and sand. Watering is done either by moistening the soil or by filling the center depression ("cup") formed by the rosette of leaves.

While it can be difficult to accurately replicate the conditions any particular bromeliad needs to bloom, some research has shown the plants can be forced to bloom by exposure to ethylene gas.1 So if you want to force your plant to spike, place it in a tightly sealed, clear plastic bag for up to 10 days with a ripe apple. The apple will give off ethylene gas as it decomposes. Make sure any water is drained from the bromeliad's central cup before attempting this.

Light

Different genera of bromeliads are tolerant of different levels of light. Some can withstand full tropical sun, while others will quickly scorch. In general, the varieties with soft, flexible, spineless leaves usually prefer lower light levels, while those with stiff, hard leaves prefer bright indirect light.

Plants that are yellowish might be receiving too much light, while plants that are dark green or elongated might be receiving too little light. Increasing light exposure can help the plant bloom, provided the other conditions are appropriate.2

Soil

Bromeliads frown indoors thrive in fast-draining potting soil that holds moisture but drains well. A mixture of 2/3 peat-based soil and 1/3 sand is often ideal. You can also use orchid mix, charcoal, or soilless potting mix. Many bromeliads that are epiphytic can be grown in containers, or you can try to grow them as authentic "air plants" mounted to boards or logs (typically secured with ties or glue).

Water

Bromeliads are very tolerant of drought conditions. In a typical house, it's usually not necessary to keep the central cup of the plant constantly filled with water. But this is an option if the light levels and temperature are high. If you do centrally water your bromeliad, make sure to flush the central cup every so often to remove any built-up salts. But in general, it's enough to water these plants very sparingly through the soil weekly during the growing season and reduce watering during the winter rest period. Never let the plant rest in standing water.2

Plants you are growing as epiphytes (as air plants without soil) need more consistent watering; drench them once a day, and give them a good soaking by submerging them in water once per week.

Temperature and Humidity

Bromeliads are also highly tolerant of temperature variations, but plants in hotter conditions need more humidity. Bromeliads prefer temperatures between 55 and 80 degrees Fahrenheit. Though some cold-hardy types can survive temperatures down to 20 degrees, they should generally not be exposed to temperatures under 40 degrees.2 They grow well indoors at humidity levels between 40 and 60 percent. In many climates, bromeliads can be moved outdoors during the summer.

Fertilizer

Bromeliads are not heavy feeders. During the growing season, use a liquid fertilizer diluted at 1/8 or 1/4 strength, applied every two to four weeks. If you use a slow-release pellet fertilizer, apply a single pellet once each season when watering the central cup. Avoid feeding mature plants in winter or when the plant begins to flower.

Are Bromeliads Toxic?

Bromeliads are not considered toxic to humans or animals, however some individuals, especially those with latex sensitivities, may experience skin reaction when contacting the sap of these plants.3