Purple Sword Plant Apoballis acuminatissima

Apoballis acuminatissima is an evergreen, tropical herbaceous perennial native to the island of Sumatra in western Indonesia. It is a member of the arum family (Araceae). This plant has silky, smooth, sword-shaped leaves of grayish green with dark green blotches, and the undersides are purplish red. Its cultivar, 'Lavallaei,' is a popular houseplant due to its ornamental foliage and low maintenance.

In the past, this plant was treated as a species of Schismatoglottis. In 2010, it was transferred to the genus Apoballis. The species epithet, acuminatissima, is Latin for "very pointed" and refers to the tip of the leaf.

As a houseplant, it grows best in bright, indirect light. Hot sunlight should be avoided to prevent the leaves from scorching. If grown outdoors during the summer months, partial shade to dappled sunlight is required. It is winter hardy to zones 10a and 10b and will not tolerate temperatures below 60 degrees Fahrenheit. The ideal temperature range for this plant is 60 to 85 degrees Fahrenheit. The plant will suffer from heat stress in temperatures that are above 90 degrees. Well-drained, moist, loamy soil with a slightly acidic to neutral pH is preferred as well as a humidity level between 60 to 80%. Allow the soil to dry out between watering to prevent root rot. Having a humidifier nearby will help increase the humidity level. It is also important to provide good air circulation and avoid overcrowding. Repotting may be necessary every 2 to 3 years. Fertilizing during the growing season will help this plant thrive. Propagate by division or stem cuttings during the spring or early summer.

Consider this tropical houseplant in a bright and warm space in your home or outside on a shaded patio during the warmer months. It may also be used in terrariums. Keep this plant out of the reach of small children and pets. To prevent skin irritation, wear gloves when handling this plant.

Insects, Diseases, and Other Plant Problems:  Monitor for spider mites and mealybugs. Overwatering can cause root rot. If the humidity level is too high, fungal diseases such as powdery mildew or black spot can occur.