If they are young they might take some time to fill out and then pop some buds - buds may pop out of the little sheath - they may not do anything else - all a wait and see, but that is part of what makes this all great. If you believe they may be ready to bloom, you could start feeding a heavy potassium fertilizer - low on the nitrogen side - something like a 5-10-15 or something with a higher last number (Potassium).