Helianthus 
Flora Frost Helianthus annuus 'Tosca'
| Leaf tip | Pointed/acute |
| Leaf base | Cordate (heart-shaped) |
| Flower type | Single |
| Leaf margin | Serrate |
| Flower scent | Unscented |
| Flower color | Yellow-medium yellow orange-021A |
| Soil fertility | Special demands |
| Leaf, general shape | Triangular |
| Flower diameter | 15 - 20 cm |
| Inflorescence | Capitulum (head); Single-flowered |
| Leaf size | 20 - 25 cm |
| soil pH requirement | Alkaline (pH > 7,5); Neutral (pH 6,5 - 7,5) |
| Leaf, main color | Medium green |
| Leaf colour, pattern | Unicolored; Veined |
| Flower color distribution | Unicolored |
| Flower, secondary color(s) | Brown-dark brown-200A |
| Leaf, secondary color(s) | Light green |
The Helianthus annuus 'Tosca' sunflower, also known simply as the sunflower, is a beautiful and vibrant plant that brings a touch of sunshine to any garden. With its unique characteristics and stunning colors, it is a favorite among both amateur and professional gardeners.
The leaves of the 'Tosca' sunflower have a pointed or acute tip, giving them a sharp and distinctive appearance. The leaf base is cordate or heart-shaped, adding a touch of charm to the overall leaf structure. The leaf margin is serrate, with small, jagged edges that give it a textured and interesting look.
One of the defining features of the 'Tosca' sunflower is its single flower type. Each flower is a solitary beauty, standing tall and proud on its own. The flower itself is unscented, but its vibrant yellow color makes up for any lack of fragrance. The color of the flower is a medium yellow orange-021A hue, radiating warmth and joy.
The 'Tosca' sunflower has specific demands when it comes to soil fertility. It requires special conditions to thrive, so gardeners should pay extra attention to the soil quality. It prefers alkaline soil with a pH greater than 7.5, but it can also tolerate neutral soil with a pH range of 6.5 to 7.5.
The leaves of the 'Tosca' sunflower are generally triangular in shape, adding a unique and geometric element to the plant's overall appearance. They are sized between 20 and 25 cm, making them substantial and eye-catching. The main color of the leaves is a medium green, providing a harmonious contrast with the vibrant yellow flowers.
In terms of leaf color pattern, the 'Tosca' sunflower boasts a unicolored appearance with veined patterns. This combination gives the plant an intricate and visually appealing look. The veins add depth and texture to the overall leaf structure, making it visually interesting from up close and afar.
The flowers of the 'Tosca' sunflower are predominantly unicolored, with the entire bloom being a radiant yellow-orange hue. This color distribution creates a striking and consistent appearance, making the sunflower a standout in any garden or floral arrangement. The secondary color of the flowers is a rich brown-dark brown-200A shade, adding depth and dimension to the overall color scheme.
Lastly, the secondary color of the leaves is a light green, which complements the medium green main color. This combination of colors adds a fresh and lively element to the overall appearance of the 'Tosca' sunflower, enhancing its natural beauty.
In conclusion, the Helianthus annuus 'Tosca' sunflower is a stunning plant with a distinctive leaf and flower structure. Its unique characteristics, including its pointed leaves, single flower type, unicolored flowers, and veined leaf patterns, make it a visual delight. The plant's specific soil fertility demands add a layer of complexity to its cultivation, making it a great choice for experienced gardeners looking for a challenge. With its vibrant colors and striking features, the 'Tosca' sunflower is an excellent addition to any garden or floral arrangement.
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