. The plant you are referring to is Allamanda cathartica 'Biscuit White,' which is a cultivar of the Allamanda cathartica species. Allamanda plants are popular tropical vines or shrubs known for their large, showy flowers. Here's some information about Allamanda cathartica 'Biscuit White':

Appearance: Allamanda cathartica 'Biscuit White' is a vigorous evergreen vine with glossy, dark green leaves. The flowers are the main attraction, featuring large, trumpet-shaped blooms. 'Biscuit White' specifically refers to the white-colored flowers of this cultivar.

Flowering: This cultivar produces clusters of large, white flowers with a yellow throat. The flowers are typically about 3 to 4 inches (7.5 to 10 cm) in diameter. They have a pleasant fragrance and appear throughout the warm months, often from spring to fall, but the exact blooming period can vary depending on the climate and growing conditions.

Growth and Size: Allamanda cathartica 'Biscuit White' can grow as a sprawling vine or a bushy shrub. As a vine, it can reach lengths of 10 to 20 feet (3 to 6 meters) or more. If grown as a shrub, it typically forms a compact mound around 4 to 6 feet (1.2 to 1.8 meters) in height and spread.

Preferred Growing Conditions: Allamanda cathartica 'Biscuit White' thrives in warm, tropical or subtropical climates. It prefers full sun exposure to ensure abundant flowering but can tolerate partial shade. The plant requires well-draining soil and benefits from regular watering to keep the soil evenly moist. It is not frost-tolerant and may need protection or be grown in containers in colder regions.

Care and Maintenance: Here are some general care tips for Allamanda cathartica 'Biscuit White':

• Watering: Provide regular watering, particularly during dry periods, to keep the soil consistently moist but not waterlogged.
• Pruning: Prune the plant after flowering to maintain its shape and encourage new growth.
• Fertilization: Apply a balanced fertilizer formulated for flowering plants during the growing season to promote healthy growth and blooming.
• Support: If grown as a vine, provide support structures like trellises or fences for the plant to climb and spread.

Caution: It's important to note that Allamanda plants contain toxic compounds, particularly in their sap, which can cause skin irritation and ingestion-related health issues. Take precautions when handling the plant and keep it out of reach of children and pets.

Remember, specific care requirements may vary slightly depending on your specific growing conditions, so it's always a good idea to consult local gardening resources or experts for tailored advice.