let them grow dahlias don't grow from bulbs but from tubers that can have many eyes and grow many stems and more flowers

Awesome! Those are some healthy dahlia.

Like Mickey noted, let them go. Unfortunately, most of mine are putting out one shoot per bulb. You got lucky.

I put 10 and only 3 have 2 or more shoots.. So the more shoots the healthier and better the plant is?

Next thing you will want to do is figure out how you want to support the plants. I'd put in the support in the next couple weeks, as it might flop as it grows higher then the stems can hold it.

Thanks!!! That helps.. What's the right time to feed them and with what?the way they grow makes me think that they must be fed!!!and yes, I will support them in the next 2 weeks before they r unable to take own weight.