Annual dahlias (Dahlia variabilis) are popular flowering plants cherished for their vibrant blooms, which come in a wide range of colors, shapes, and sizes. Here's some information about annual dahlias:

1. Appearance: Annual dahlias are herbaceous plants that grow from tubers or seeds. They typically have upright stems with dark green foliage. The flowers vary greatly in size and shape, ranging from small, single blooms to large, double flowers. The colors can be solid or bi-colored, and they include shades of red, orange, yellow, pink, purple, and white.

2. Height: The height of annual dahlias varies depending on the variety, ranging from about 1 foot (30 cm) to 4 feet (120 cm) tall. Some dwarf varieties are suitable for containers or edging, while taller varieties make excellent focal points in garden beds or borders.

3. Blooms: Annual dahlias produce abundant flowers throughout the summer and into fall, attracting pollinators like bees and butterflies to the garden. Deadheading spent flowers can encourage continuous blooming and keep the plant looking tidy.

4. Sunlight: Dahlias thrive in full sun, requiring at least 6 to 8 hours of direct sunlight per day to bloom profusely. They can tolerate some light shade, but they may produce fewer flowers in low-light conditions.

5. Soil: Dahlias prefer well-draining soil with moderate fertility. They can adapt to various soil types, including loamy, sandy, or clay soils, as long as the drainage is good. Amending the soil with compost or organic matter can help improve soil structure and fertility.

6. Watering: Dahlias have moderate water needs and prefer consistently moist soil. Water deeply and thoroughly, allowing the soil to dry out slightly between waterings. Avoid overwatering, as this can lead to root rot and other moisture-related issues.

7. Fertilizing: Dahlias benefit from regular fertilization to promote healthy growth and abundant flowering. Apply a balanced, water-soluble fertilizer every 4 to 6 weeks during the growing season, following the package instructions.

8. Spacing: When planting dahlias, space the tubers or seedlings according to the mature size of the variety. Taller varieties may need more space between plants to allow for proper air circulation and prevent overcrowding.

9. Support: Taller varieties of dahlias may require staking to support their stems and prevent them from flopping over. Install stakes or cages at planting time or when the plants are still young to avoid damaging the roots later.

Overall, annual dahlias are versatile and colorful plants that add beauty and drama to garden landscapes. With their stunning blooms, easy care requirements, and wide range of varieties, they are a popular choice for gardeners looking to create vibrant and eye-catching displays.