Angelonia biflora aka Tortoise Flower

Angelonia biflora typically grows 12 to 36 inches tall and 8 to 12 inches wide, depending on cultivar and growing conditions. It has an upright, erect habit that may sprawl slightly but does not require staking. Growth rate is moderate to fast, especially in warm climates with full sun.

Angelonia biflora is native to tropical South America, specifically Colombia, Guyana, and the northeastern and west-central regions of Brazil. The closely related Angelonia angustifolia originates from Mexico and the West Indies. As a genus, Angelonia is native to warmer regions of the Americas.

Angelonia biflora is drought tolerant once established. It prefers well-drained soil; once plants are established, allow the soil to dry somewhat between waterings. Avoid overwatering, as waterlogged soil encourages phytophthora root rot. Plants appreciate consistent moisture during establishment.

Angelonia biflora prefers moist, fertile, well-drained soil. Good drainage is essential to prevent root rot. It tolerates a range of soil types as long as drainage is adequate. Sandy or loamy soils with good drainage are ideal.

Angelonia biflora is a heat-loving plant that thrives in warm summer temperatures and tolerates high humidity. It is cold hardy only to approximately USDA Zone 9 (minimum temperatures around -6°C / 20°F). In cooler climates it should be treated as an annual or brought indoors before frost.

In USDA Zones 9 and warmer, Angelonia biflora can remain outdoors year-round. In cooler zones, treat as a summer annual or bring container plants indoors before the first frost. Mid-season, plants can be sheared back by half to encourage a fresh flush of blooms, which appear within 2-3 weeks.

Fertilize Angelonia biflora every two months with a slow-release balanced fertilizer. Plants are not heavy feeders but benefit from regular light fertilization to maintain continuous bloom production through the long summer season.

Angelonia biflora has fragrant flowers and slightly aromatic foliage. The scent is subtle and pleasant, making it an asset in garden borders and cutting arrangements.

Flowers are small (3/4 to 1 inch), two-lipped, and snapdragon-like, borne on upright spikes up to 8 inches long. Colors include blue, pink, purple, lavender, rose, and white. Blooming is continuous from June through September without deadheading. Flowers are fragrant.

Angelonia biflora is sometimes sold under the synonym Angelonia grandiflora. In the trade, Angelonia cultivars (primarily derived from A. angustifolia) include 'Archangel Blue,' 'Archangel Pink,' 'Serena White,' and 'Night Sky.' Cultivars vary in disease resistance; 'Archangel Blue,' 'Archangel Pink,' and 'Serena White' show good phytophthora resistance while 'Night Sky' has poor resistance.

Angelonia biflora is an excellent outdoor garden plant for warm climates. It is very heat and drought tolerant, deer resistant, and largely pest resistant. In zones cooler than 9, it is grown as a summer annual. It is not suited to indoor cultivation as a houseplant.

Plants can be sheared back by half in mid-season if flowering slows or the plant becomes leggy. After pruning, new blooms appear within 2-3 weeks. Regular deadheading is not required as plants bloom continuously without it.

Angelonia biflora is generally pest resistant and deer resistant. It can occasionally be affected by aphids and powdery mildew. Phytophthora root and crown rot is a risk in poorly drained soils. Selecting resistant cultivars such as 'Archangel Blue' or 'Serena White' can reduce disease risk.

Angelonia biflora is typically propagated from stem cuttings or purchased as transplants. Many modern cultivars are vegetatively propagated to maintain true-to-type characteristics. Seed propagation is possible for some species but cultivar characteristics may not come true from seed.

Caring for Tortoise Flower is a breeze, as it is highly adaptable and forgiving to minor neglect.

Tortoise Flower requires abundant, bright, and direct light to thrive. The best placement for this plant is within one foot of a window to ensure it receives enough light. If you live in an area with more extreme weather, such as hot summers or cold winters, you may need to adjust the placement of the plant accordingly. During hot summer months, it is important to place the plant away from full sun, as this can cause the leaves to yellow or burn. During cold winter months, it is best to move the plant closer to the window to take advantage of the extra light that can help it survive. By keeping an eye on the current weather in your area, you can make sure your Tortoise Flower is always in the right place to thrive.

Ploi lacks confirmed information on the toxicity of this plant. If you, a relative, or your pet accidentally consume plant material with unknown toxicity, it's best to consult a medical expert.