Growing cactus dahlias in pots can be a bit challenging due to their large size and height. These dahlias can grow to over 2 meters in height, which makes them not ideal for container gardening. It is generally recommended to grow dahlias in pots that don’t usually require staking.
However, if you are determined to grow cactus dahlias in pots, there are a few things to consider. Firstly, you will need to choose a large and deep container to accommodate the root system of these plants. A pot with a diameter of at least 18 inches and a depth of 12 inches would be suitable.
Next, make sure to use a well-draining potting mix to avoid waterlogging the roots. Cactus dahlias, like other dahlias, prefer moist but not soggy soil. Adding some perlite or sand to the potting mix can help improve drainage.
When planting the cactus dahlias, place them at a depth of about 6 inches in the potting mix. This will ensure that the tubers are covered adequately and provide stability to the plants.
As cactus dahlias are prone to toppling over due to their height, it is crucial to provide support for them in the containers. You can use stakes or trellises to provide support and prevent the plants from bending or breaking.
Regular watering is essential for dahlias, especially during hot and dry periods. Water the plants thoroughly whenever the top inch of the soil feels dry. However, be careful not to overwater as it can lead to root rot.
Fertilizing the cactus dahlias is also important to promote healthy growth and abundant blooms. Use a balanced, slow-release fertilizer or a water-soluble fertilizer according to the manufacturer’s instructions. Apply the fertilizer every four to six weeks during the growing season.
In terms of sunlight, cactus dahlias require at least six hours of direct sunlight daily. Place the pots in a sunny location, such as a balcony or patio, to ensure they receive adequate light.
Lastly, regular deadheading of faded flowers will encourage the production of new blooms and prolong the flowering period. Remove any dead or yellow leaves to maintain the plant’s overall health and appearance.
While it is possible to grow cactus dahlias in pots, it is important to consider their size and support needs. If you have limited space or prefer to grow dahlias in containers, it is advisable to choose smaller varieties that are better suited for pot cultivation.
