Getting an Air Plant to Flower, and What Happens Afterwards

One flowering per plant, and then pups

This is the single most important thing to understand about air plants, and it surprises most people the first time. An individual plant flowers once in its life. It does not repeat the following year. After the flower fades, that plant slowly declines over the following months to a couple of years, and while it declines it produces offsets, called pups, from around its base.

So a flower is not the beginning of a display cycle, it is the turning point of the plant's life. Once you know that, the sequence stops looking like a failure: the browning outer leaves after a bloom are not a watering mistake, they are the parent handing everything over to the next generation. Your job after flowering is to keep the parent going long enough to raise those pups.

The pups replace the parent entirely. A single plant that has flowered will typically leave two or three pups behind, which is why a well kept collection grows rather than shrinks.

What the bloom actually looks like

Flowering usually starts with a color change rather than a flower. The center leaves flush pink, red or orange over a week or two, and that blush is often mistaken for stress or sunburn. Then a spike pushes out of the middle and the actual flowers open from it, commonly purple, violet or white, and often only a few at a time over one to three weeks.

The colored bracts hold their shade for far longer than the flowers themselves, sometimes for a couple of months. The whole display, from the first blush to the last faded bract, can run for two or three months, which is far longer than the flowers alone suggest.

How to bring the flower on

There is no way to force a plant that is not old enough, and most plants flower somewhere between two and five years old depending on type and conditions. What you can do is make sure nothing is holding it back, because a plant kept slightly too dark or fed nothing at all can simply never reach flowering size.

1. Give it more light than you think Light is the single biggest lever. A plant in bright indirect light near an east window will flower years before an identical plant on a shelf across the room. Silver, scaly types in particular need genuinely bright conditions before they will bloom at all.
2. Feed monthly in the growing season Add a quarter strength fertilizer to the soaking water once a month through spring and summer. An unfed plant will survive for years and never accumulate enough reserves to flower.
3. Let it feel a temperature swing A difference of about 10F (6C) between day and night, which happens naturally near a window or outdoors in mild weather, encourages flowering. A room held at exactly the same temperature all day and night tends to delay it.
4. Keep the base dry between soaks A plant that has been fighting off rot at the base puts nothing into flowering. Consistent drainage after every soak is not just about survival, it is what leaves the plant with something to spend.

Sealing a plant with a ripe apple in a bag is a commonly repeated trick, using the ethylene the fruit gives off. It sometimes works on a plant already close to flowering, but the still, humid air in the bag risks rot. It is not worth it.

Looking after the plant while it flowers

Keep watering on the same schedule while it is in bloom, but change how you do it. Soaking a plant with open flowers spoils them and can leave water sitting in the spike, so soak the base and lower leaves while keeping the flowering spike clear of the water, or switch to a thorough misting of the leaves for those few weeks and go back to soaking once the flowers are done.

Do not move the plant to a different light level in the middle of flowering. A move at that point commonly causes the spike to abort, and once aborted the plant will not produce another one.

After the flower fades

When the bracts have lost their color and dried out, cut the spike off at its base with small scissors, taking care not to cut into the center of the plant. Leaving a dead spike in place is not fatal, but it holds moisture in the center and gives rot an opening.

Then keep feeding monthly and soaking as normal. The parent will look progressively tired, and its outer leaves will brown one by one over the following months. That is expected. Pull the fully brown leaves away gently, leave anything still green, and wait for the pups. Removing the parent too early takes away the reserves the pups are living on.

Write down the date the first blush appeared and the date the spike emerged. If you keep several plants, a season of those dates tells you which positions in your home actually bring plants into flower, and that is far more useful than any general rule.

Why a plant will not flower

If a plant has been with you for several years in good condition and has never bloomed, work through this list before concluding anything is wrong with it.