I’ve got four plants going in my 2x4…and yea first time growing. the biggest plant sprouted out of soil on July 28…so getting close to 2 months old. the other 3 are a week or 2 younger. They all started off great, except for one that was stuck in seedling stage for a week and a half (was able to get it going with water and recharge). but within the past 2 weeks the growth has slowed and yellow leaves and reddish stems have begun to spread. my temps go from about 84 to 72. Humidity is usually around 50 percent. Light is a sp3000, about 25 to 30 inches away. I have been using distilled or purified drinking water the entire time. I never had a ph meter until about two weeks ago, so I never could check it. The past 2 or 3 waterings I’ve aimed for 6.0 ph. I’ve used cal/mag twice, each time using half the recommended dose, with some recharge mixed in as well. I’ve also fed it one time about 2 weeks ago with general hydroponics flora micro and flora gro(using 1/4 of the recommended dose). I did water til runoff about A week ago and ph was 6.8 and the ppms were 285…am I just not feeding enough? Not sure if I should start using tap water(mine is ph7.4 and ppms 585)…so yea any ideas?
.png)
I would put that pH in 6.4-6.7, that ppm is a bit low as well. I see a couple deficiencies going on starting with nitrogen. Make sure your not over watering. I'd bet the medium pH is pretty low. If it were my grow I'd flush the medium at 7.0, finish with 1/2 dose nutrients and cal-mag at 6.6. 1/2 dose next feed, then 3/4 then to full, but that's me.