Dahlia: How to Grow It for a Colourful Summer Garden

Few flowers draw the eye quite like the dahlia. With petals ranging from refined, delicate shapes to large, full and showy blooms, it is widely seen as one of the stars of summer gardens. Native to Mexico, this plant comes in thousands of varieties and produces flowers in almost every colour. It is also fairly straightforward to grow, provided it gets plenty of sunshine and a handful of basic care steps. Flowering typically begins in summer and continues until the first cooler temperatures arrive.

Why is the dahlia so popular in gardens?

What most sets the dahlia apart is its extraordinary variety of sizes, forms and colours. There are compact types that suit pots, as well as taller varieties that can grow beyond 1.5 metres, making them ideal for borders and the back of the garden.

Another key attraction is how freely it flowers. If you remove spent blooms and keep up simple maintenance, the plant keeps pushing out fresh buds through much of the season, helping the garden stay bright and colourful.

How do you plant dahlias to get more flowers?

Growing usually starts from tubers, which should go into the ground only once the risk of frost has passed. The soil needs to be fertile, rich in organic matter and-most importantly-free-draining to prevent the roots from rotting.

Dahlias do best in a bright spot, with around six to eight hours of sun each day. In very hot areas, morning sun often supports more balanced growth.

• Full sun for at least six hours a day
• Fertile soil with good drainage
• Water moderately after shoots emerge
• Use mulch to retain moisture
• Provide a stake for taller varieties
• Feed during the growth period

What care helps extend the flowering season?

Once the first shoots show, watering should become regular. Aim to keep the soil lightly moist, but never waterlog it. Adding mulch also helps hold in moisture and cuts down on weeds.

Another useful practice is deadheading-removing faded flowers. This encourages the plant to set new buds. With some varieties, pinching out the tips of young shoots can promote more side growth and increase the number of flowers produced across the season.

• Water without soaking the soil
• Remove faded flowers regularly
• Apply light feeds during flowering
• Use staking for tall plants
• Protect tubers in areas with harsh winters
• Keep good air circulation between plants

Is it worth growing dahlias in the garden?

If you want a garden full of colour in summer, the dahlia is an excellent choice. Alongside its huge range of shapes and shades, it grows well in both pots and borders, and can flower for months when cared for properly.

Given a sunny position and well-prepared soil, this species rewards gardeners with an abundant display that, in many areas, lasts right through to early autumn.

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