Hey I watered my plants tonite, all of which are about a week or so into flowering, and my water going in had a pH of 6.75, yet the pH of my run-off water is closer to 5.5. Should I flush with ph'd water untill my run off is correct, or is it normal for run off to be a little low? BTW I'm growing in FFOF, which I thought was pH adjustable or something.
soil has a tendency to lower ph. To fix it, you need to flush until the runoff is at the appropriate level. Another option is add some dolomite lime to your soil, that will also stabilize the PH.
Thanks man. Can I add the lime on top of the soil for this grow since Im already into flowering, and maybe just let it soak in as I water or is it too late for that. And also if I can do this how much do you recommend adding? The plants are in 5 gallon pots with OF soil.