Posted: 28/04/2015 at 18:32
I would agree with Verdun, I dont agree with keep feeding plants, my dahlias are started of in any old rubbish compost, from last year tubs or anything that falls off when I repot. When they get planted out they will get some home made compost put round them.
If you feel you want to feed it, wait until it gets flower buds, if you feed if first you will just get lots of green, try putting it in a bigger pot, depending On how tight the roots are.
Hard gardener me! I like to make my plants work.