When planting your dahlia out in the garden, dig a hole much larger than you think you’ll need. This will loosen the soil closest to the roots and make it easier for the plant to push its roots out into the fresh soil and establish well.
Plant your dahlia only as deep as the top of the pot it is already growing in. If you bury it any deeper, it could rot.
Dahlias can successfully be grown in containers as long as it is big enough, that depends on the type of dahlia you choose, there are dwarf and patio ranges on the market but that doesn’t mean that you can’t grow any of the others in large pots to create a fantastic display.
Label your dahlia and keep a look out for slugs and snails, they love to feast on the new shoots of dahlias.