I actually foliar almost everyday with it. But you can do it once a week if you like or everyday, just depends on your situation. But if my plants are flying along full tilt boogie I might hit em twice some days sometimes. If they start to look stressed i back off. Im diggin it though cause i run the same nutes from clone to flower and use foliars to add anything else to my regime. In veg i use kelp silica and sweet no ph ppms around 900 and i spray anytime i look at them. When its time for boosters i just pick up the other bottle and spray the MOAB mix. And I use it right on through till the last 2 weeks when i hit it hard with the MOAB only through the soil and flush till its ready. Im actually just now starting to use HPK with the MOAB and I gotta agree with true grit it really seems to be a sweet mix, with organic smells but a more chemmy blown out bud structure.