Originally Posted by GeToChKn
The sooner towards the lights coming on, the more the plants can use it. Plants only use carbon and ferts during lighting periods, so putting it in 2 hours before the lights go off is sort of pointless. It's like putting out a 4 course meal at 1am when everyone is just going to bed. It's just going to sit on the table and rot all night.
No i think i said something wrong. I can't put it right before lights on. But i can put it a few hours before, not after the light go out.