The Transvaal Daisy (Gerbera jamesonii) is known for its striking, brightly colored blooms. These flowers originate from South Africa and are valued for their cheerful appearance and long vase life. While the size of the flower head can vary, its typical dimensions are a primary characteristic of the species.
Typical Flower Width
The Transvaal Daisy typically produces a flower head that measures between 3 to 5 inches (7.6 to 12.7 centimeters) in diameter. This represents the total span across the face of the bloom. The structure is technically a composite flower head, or capitulum, belonging to the Asteraceae family (the same family as sunflowers and common daisies).
What appears to be a single flower is actually an organized cluster of many tiny individual flowers. The colorful, strap-like “petals” around the edge are called ray florets, while the tightly packed center is composed of disc florets. This composite nature contributes to the flower’s robust appearance. The 3 to 5 inch measurement is a reliable benchmark for many garden cultivars, but it can be influenced by how the plant is cultivated.
Factors Affecting Flower Diameter
The diameter of a Transvaal Daisy bloom is directly influenced by its growing environment.
Light Exposure
Light exposure is a significant factor, as the plant requires at least six hours of direct sunlight daily to support vigorous blooming and achieve maximum flower size. Insufficient light levels will often result in fewer blooms that are noticeably smaller.
Nutrient Balance
Nutrient balance is another determinant of flower size and quality. Over-fertilization with nitrogen encourages lush leaf growth at the expense of flower development, resulting in smaller blooms. Conversely, adequate levels of phosphorus and potassium are necessary to support robust flowering and larger, better-formed flower heads.
Plant Age
The age of the plant plays a role. Established plants typically yield the largest and highest-quality flowers in their second and third years of growth.
Distinguishing Between Gerbera Types
The size range established for the Transvaal Daisy is primarily based on the standard bedding and garden varieties. The potential flower diameter varies significantly based on the plant’s genetics.
Large-flowered cut varieties, bred specifically for the floral industry, can produce blooms that exceed the standard range, sometimes reaching up to 7 inches (17 to 18 cm) across. On the other end of the spectrum are compact or miniaturized varieties, often called mini-Gerberas, which are genetically programmed to produce smaller flowers. These types are bred for container gardening and naturally fall below the 3-inch minimum of the typical garden standard.