Dahlia

Choose compact or small-flowered types if you want container-friendly plants or a balcony display; they suit smaller pots and need less staking. Pick medium to tall, large-flowered types for mixed borders or when you want striking focal plants and long-stemmed cut flowers—these perform best in the ground and usually need support. Pompon and small decorative types work well for dense bedding and mass planting because they give lots of flowers on relatively short plants.

Dahlias need a sunny site (at least 6 hours direct sun) and fertile, well-draining soil. Avoid waterlogged spots—good drainage prevents tuber rot. Improve heavy soil with compost or grit and plant where they are sheltered from the strongest winds to protect tall stems and large blooms.

Plant tubers after the last frost, water regularly during the growing season and feed with a balanced fertilizer to encourage repeated blooms. Deadhead spent flowers to extend flowering, and stake or use supports for taller types early in the season. In frost-prone areas lift and store tubers over winter; in mild climates apply a thick mulch to protect them in the ground.

Use large, bold blooms as focal points or at the back of a border and repeat a colour or tone along a bed to create cohesion. Mix contrasting colours (light vs dark) for drama, or combine similar shades for a softer look. Small pompon or decorative forms add texture in front borders and containers; choose flower forms and heights to build layers and ensure blooms are visible from paths or seating areas.