Dahlia Tubers Plant. Knowing where to plant dahlia tubers is important if you want to have big, gorgeous blooms this summer. We have found that if you are planting multiple tubers in a hole it is best to plant the tuber with the eyes opposite of each other.
Our dahlia bulb planting guide will have everything you need to know about how. Dahlias really are stars of the summer and autumn garden, flowering up until the first frosts. Plant approximately four to six inches deep.