go ahead, and give a regular dose of the schultz 5-10-5 to your plants, then use a half-strength dose, once weekly ... you can continue with your worm castings, if you'd like ... you really need a lot more light than what you have, but we make do, with what we have, eh ? ... 'alternating' branches, indicate the plant is mature, and ready for flowering ... instead of two branches sprouting from the main stem opposite each other, they are 'staggered' ... you can switch to flower at any time, but best results, come from waiting for maturity ... be sure to research the Basic Growing threads, most of this really should be known, before even planting seeds ... hang in there, your plants are looking pretty good, actually ... good luck