O, I bought 3 different dahlias about 1990. One, I lost . . . or, deliberately abandoned to the winter. It was an orange with white petal tips. The things would just burn-up instantly in the sunshine :/.
I made a couple of
major orders from Swan Island over the years. Probably 50 varieties have cycled thru my garden. (That's
major to me considering the price of the roots!

) I've gotten a few here and there, even started pompons from seed

.
Lost many, abandoned a few . . .
There were just about 300 plants each season over the last few years but my dahlia garden is a bit smaller this year. There are at least 30 separate varieties but I'm not a
collector. I'm not saying that there is 1 thing wrong with being a collector - it's just that my pleasure is in the brightness of the blooms and bouquets!
A good plant can produce a half dozen roots with enuf vitality to make it thru a winter. Some, only have a couple. Others can produce a dozen!
Steve