I avoid clay soils that hold onto too much moisture and stop oxygen from reaching the roots. For potted Dahlias, I choose a high-quality potting mix and amend it with sand or perlite to improve ...

Dahlias are stunning flowers that come in all ... Use a seed-starting soil to give them healthy, aerated soil that's easy for tender roots to grow through. Keep the soil moist as they grow.

All you need to do is trick the dahlia tuber into making new shoots in late winter. These can be snipped off and are so vigorous that they'll root in compost within seven to eight days.