The dahlia's brilliant blooms add long-lasting colour and variety to your garden. With the right timing and care, these flowers produce flowers all summer long.
When to Plant
Do not plant dahlia tubers outside until after the last frost of the season. Soil temperatures of 15.6 degrees Celsius indicate a good time to plant. Overly wet soil will cause the tuber to rot and make it necessary to wait until the soil dries out.
Where to Plant
Dahlias prefer full sun for most of the day and should be placed to take advantage of direct sunlight. A hot-dry climate means you can plant in an area with fewer hours of direct sunlight, mainly in the morning.
Dahlias need a light soil composition. Soils with high clay content will need to have mulch or sand added to them to make it easier for the flower to grow. Moisture rich soils will need the addition of sand to promote drainage.
After planting, the bulb will be dormant for a short period and only needs light moisture. Soon the plant will appear and one watering a week will be enough to keep it healthy. In the heat of the summer or in hot-dry climates, it needs two waterings a week.
To get an early start, in colder areas, plant the bulbs a few weeks early indoors in pots with a good quality potting soil. This will allow the bulb to be dormant in the warm soil for a few weeks and will speed the blooming time once planted outside.
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