Black Bat Flower Plant Profile

Deep purple bat flower among glossy large green leaves.

Lesley A Butler / Flickr / CC BY 2.0

The black bat flower is an exotic looking, unusual plant that is somewhat difficult to grow, but rewarding for its unusual shape, texture and color in the garden. True to its common name, the bat flower looks like a bat with its wing shaped bracts and seed pods that look a bit like bat faces. It is an understory plant native to the forests of Asia and Australia, and grows best in a semi-tropical environment. The roots have medicinal properties, especially for intestinal complaints.

It is sometimes also referred to as tiger beard, due to its long bracteoles which look like whiskers. The purple variety is a dark dusky color that ranges from maroon to purple, but often looks black. There is also a white flowering variety (Tacca integrifolia) that grows twice as large as the black one. Dramatic in the garden, bat flowers do not really survive long in a vase and so aren't really useful as cut flowers. The bat flower will bloom from late spring through early fall with new blooms appearing repeatedly throughout the season.

Botanical Name Tacca chantrieri
Common Name Bat flower
Plant Type Perennial
Mature Size 36 inches tall, 12 inches wide
Sun Exposure Partial sun to dappled shade
Soil Type Fertile, well-drained
Soil pH 6.1 to 7.5
Bloom Time Late summer through fall
Flower Color Black (dark purple), white (Tacca integrifolia))
Hardiness Zones 9b to 11
Native Areas Asia, Australia
Purple bat flower in front of large shiny green leaves.
This bat flower in the Taipei Bo anical Garden looks nearly black, adding to its mystique.  Rise Liao / Flickr / CC BY 2.0

How to Grow Bat Flower

While this is a fairly tropical plant, it does do well in some parts of the United States, and can be grown successfully in Florida, Louisiana, Mississippi and parts of California, wherever a moist, warm environment can be found. It may be necessary to create a small micro climate that is hospitable to this somewhat delicate plant. The bat flower is generally not vulnerable to pests, other than the usual slugs and snails one finds in a tropical garden.

Light

The bat flower requires warm temperatures but prefers a shady location. Plant where it will get indirect light, on the north side of a house, preferably in a setting with additional tropical understory plants.

Soil

Bat flower needs a rich, well-drained soil with plenty of organic matter. Amending soil with peat moss, pine bark, and compost may prove necessary. For container growing, use a rich potting medium with 50 percent soil, 40 percent amendments and 10 percent sand for good drainage.

Water

After planting, keep the soil moist and water consistently. Bat flowers should not be allowed to dry out for too long. But make sure the planting location has good drainage.

Fertilizer

Black bat flowers benefit from fertilizing. Using a liquid fertilizer suitable for orchids is appropriate, applied every week, or use a general slow release fertilizer.

Temperature and Humidity

Since bat flowers are a semi-tropical plant, they do not withstand cold temperatures. If the temperature goes below 55F, bat flowers may die. They are happiest when the temperature is between 70 and 80 degrees. They can also be grown indoors but a consistently moist environment should be provided. Using a plant mister and having a humidifier will help ensure the bat flower gets the moisture it needs.

Propagating Bat Flower

The bat flower may be propagated from seeds that have been allowed to dry well, but they will take some time to germinate. Harvesting the seeds from the plant requires waiting until the seed pod has matured and split open. Bat flower can also be propagated from a tuberous root or rhizome cutting. Divide these rhizomes in the fall, and plant three feet apart. You can also order rhizomes from a catalog. Be patient when propagating, as the rhizomes need to reach a large enough size before they will form flowers.

Growing in Containers

It's possible to grow black bat flower in containers. If keeping them indoors, locate them near a window where the light is indirect. They also appreciate decent air circulation, as opposed to a closed greenhouse environment. Don't allow the plant to become root bound; keep an eye on it and repot into a bigger container as needed. Repotting once every year is a good rule of thumb. A wide shallow pot works best. You can put the containers outside in the summer, but avoid placing them in direct sunlight.