not knowing how or in what you are growing them ...

i would simply suggest using 1/4 strength water sol every time you water ...

wont burn.. probably wont build up ... and be the right proportion for the size ...

in my world.. definitely not a granule or osmacote thing ...

i used to put a 1/4 teaspoon in a one gallon bleached out milk jug.. and fill with water ... used to have 3 or 4 of them filled.. at room temp.. at all times ....

ken

Am growing them in 4" pots, some in larger pots as they warrant repotting, in Miracle Gro seed starting mix. They are doing well - I just would like to push them along a bit and see them get sturdier.

When you say water soluble fertilizer, do you mean like Miracle Gro, Peters, fish emulsion, kelp or???? I have all kinds of fertilizer that I use on my roses - but not sure what would do best for these seedlings. Thanks for the help!
Judith

Judith,
If you look at the seed starting mix bag, you'll see it contains a fertilizer, usually something like 1-1-1. This usually plays out after 90 days, so giving them something will keep them growing strong. Watering with a weak solution of fertilizer is good, like Ken suggests. Both Miracle grow and Peters are water soluble as well as the organics you mention. I like to use a rooting stimulator which has a ratio like 1-2-3 at first, then a balanced fertilizer (1-1-1 ratio) once they have around 6 leaves. Of course, to utilize this food, they need good light. Sounds like you're having fun.
Ed

Having a great time Ed! Thanks for your help - I am in process of putting them in bigger pots now, and letting them have more sunshine [the little we get] so going to get some root stimulator, never tried that. Am trying to get a system in place so I know what works best with them.
Judith