Yes most def! Your plants are big enough to use more nitro ferts. I would up the feedings so that your lower leaves will be strong,healthy to produce potent buddage when it's time! KEEP SMOKE ALIVE!!Aaaargh! Fucking bollox. My plant is sick. I have no idea why.
I've been using small amounts of bio bloom which I bought from a headshop - only very small amounts and not with every water.
Possible Nitrogen deficiency? Any ideas anyone?