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 ...

If you live in a hot, dry climate, you may need to water more than once per week. Dahlia tubers do not have roots initially, ...

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.