- Species and varieties: Thunbergia alata, commonly known as Black-eyed Susan vine, is a species of flowering plant in the Acanthaceae family. It is native to Eastern Africa and is known for its vibrant, colorful flowers. Varieties include 'Sunny Susy', 'African Sunset', and 'Blushing Susie'.
- Hybrid or heirloom: Thunbergia alata can be found in both hybrid and heirloom varieties. Heirloom varieties are often prized for their traditional characteristics and genetic purity, while hybrids may offer improved vigor, disease resistance, and unique flower colors.
- Pruning and training: Regular pruning and training are essential to encourage bushier growth and more abundant flowering. Pinch back the tips of young plants to promote branching. Support the vines with a trellis or other structure to help them climb and spread.
- Fertilization needs: Thunbergia alata benefits from regular fertilization during the growing season. Use a balanced, water-soluble fertilizer every 4-6 weeks to promote healthy growth and flowering. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Thunbergia alata is suitable for USDA hardiness zones 10-11. In cooler climates, it is often grown as an annual or in containers that can be brought indoors during the winter.
- Climate requirements: This plant thrives in warm, sunny climates with temperatures ranging from 60°F to 80°F (15°C to 27°C). It prefers full sun to partial shade and well-drained soil. It is not frost-tolerant and should be protected from cold temperatures.