PH problem

[PurpleWreck]

got 7 plants about 20 days old some look good,others a lighter green and some of them with yellow leaves(1 has black spots). My soil master says plants ph is 7-7.5. how do i make soil more acidic? please help

[Faddenator]

You can go to a nursery and get some ph down... or... you could always use a little bit of lemon juice! yum.

good luck. :thumbsup:

[the image reaper]

yellow leaves, black spots, I think you're keeping the soil too wet ... let it dry between waterings ... cannabis likes to go thru wet & dry cycles ... good luck :smokin:

[PurpleWreck]

i have heard about using lemon juice, does it really work or am i committing plantocide?1 plant looks bad maybe test that one. dont want to lose it but i got afgan germinating as we speak. but the name to the other stuff is ph down u say..

[PurpleWreck]

yellow leaves, black spots, I think you're keeping the soil too wet ... let it dry between waterings ... cannabis likes to go thru wet & dry cycles ... good luck :smokin:

i water them every 3-4 days when cups are light. 20 days maybe time to re-plant. would ph 7.5 turn leaves yellow and black. when would u use fertilizer?

[PurpleWreck]

can i use lemon juice ? anybody ?

[lampost]

can i use lemon juice ? anybody ?

I think all the overwatering talk makes first-time growers not water enough! How tall are they? If they are in small cups for containers then you can probably be watering more than every 3-4 days! As they start to get rootbound you can water more and more, like every other day, maybe more.

I was having similar problems. Remember if they're totally dry for a day or two, they're not getting ANY moisture or nutrients! The soil needs to be slightly moist, not wet! If you're in an arid climate you'll have to water slightly more.

When to use nutes depends on what kind of soil/mix you're using. Your plant probably needs them if there weren't a lot in your base mix. If your soil was "hot" you're probably getting right to the point where you might want to hit 'em with a 1/4 or 1/2 strength dose and see how they respond. But if they didn't look like they needed it then maybe I'd hold out.

[Faddenator]

can i use lemon juice ? anybody ?

Yes you can. I wouldn't suggest using something if it would kill your plant. you just have to make sure to only use enough to bring it down to 6.5.

[PurpleWreck]

thanks lampost and fad, watered yest. they look a bit better and far as the lemon juice i have been testing ph of lmj/water so next watering i will add. sorry i dont have pic but 21 days and range from 7- 10 inches 5- 7 nodes. also bout to check out led lights, check for post later. your input would be greatly appreciated.

[Faddenator]

Off the top of my head I can tell you that led lamps have specific red/blue ratios, and choosing the right one is fairly important. Problem is, I have no idea what a good ratio for them is. anybody else know???