How to Grow Black Dahlias at Home (Essential Guide)

While all types of dahlias are popular garden flowers, black dahlias are something extra special.Growing black dahlias is similar to growing any other type of dahlia. By following these steps, you’ll be on your way to alluring, dark blooms.

When to Plant

Although black dahlias are technically perennials, they’re treated as annuals in much of the United States. That’s because neither the plants nor the tubers can tolerate extended periods of below-freezing temperatures.

How to Plant

Dig a hole that is about four to six inches deep, depending on the size of the tuber. When you place your tubers in the soil, it’s important to follow the proper orientation.


Black dahlias prefer rich, well-drained soil. You can amend your soil with compost to increase drainage and add nutrients if you’re dealing with heavy clay.As far as pH goes, black dahlias prefer a neutral to slightly acidic pH. Aim for a soil pH between 6.0 and 7.0.


All types of dahlias, including black dahlias, prefer full sun. Therefore, you should plant them in an area that receives at least eight hours of direct sun each day.


You should not water your dahlia tubers until after they sprout. If the soil is wet before the tubers are actively growing, the tubers may rot. This is especially true when the soil is still cool.


Although dahlias may grow without any additional nutrients, they will benefit from regular fertilizer applications. However, choosing the correct type of fertilizer is essential if you want loads of healthy flowers.

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