- 1). Wash your planting pot with hot, soapy water. Rinse it with a mixture of one part bleach to nine parts water. This is especially important for used pots. Washing it kills plant diseases, organisms and pests.
- 2). Mix one part of well-rotted compost or manure with four parts of potting soil. Dahlias are heavy feeders and appreciate soil that has an abundance of organic materials. The compost will provide a slow release of nutrients to the dahlias as they grow and bloom.
- 3). Place a piece of wire mesh screen in the bottom of your pot over the drainage holes. This will keep the soil in the container and allow the water to drain freely.
- 4). Fill the pot halfway with your soil mixture. Place the dahlia plants on top of the soil. Pile a little soil up around each plant to hold them in place.
- 5). Fill the rest of the container with the soil mixture one to two inches from the rim. This allows room for the water to pool on top of the soil.
- 6). Gently press the soil down around the plants. Water your dahlias to settle the soil. Drain well and move to an area of bright light.
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