you could also use sodium bicarbonate (in water, add a bit, mix, check ph, repeat) to raise the PH instead of the lime
4x5 Reviewed by 4x5 on . PH question Im on my fourth grow and decided to start troubleshooting everything and taking a more detailed approach to my growing. I have noticed that no matter what I do to my plants (light, air temp, ect) they seem to take forever to grow and my yields are good, but for the most part small. I cant seem to get my buds to fill in densely. Im only growing 2 plants in a 2'deep x 3.5' wide x 4' tall cabinet with a 150 watt HPS lamp for flowering and 3 "150watt" (23watts) CFL blue spectrum bulbs for vegging. Rating: 5