pH probs? I'm stumped!

[F10werChyld]

I have 2 girls who look like this and 2 that are fine? Germinated in paper towels on 3/26, planted in Big Rootz on 3/31, broke soil on 4/2. Growing under Vivar spectra LEDs at about 28" above the tops.
Really appreciate any help with this one.

[duckman]

how's the pH?

[F10werChyld]

IDK! I ordered a pH meter from amazon like 2 weeks ago!

[duckman]

looks like they're pulling nitrogen from the bottom leaves...could be the pH at roots is not right, could be they need to be transplanted if they have outgrown pots, hard to tell from the photos...how big are the pots? how tall are the plants?

[Obi-Wan]

Are the 2 plants that look like this the same strain? Is this a new problem or did the lower leaves show these symptoms before the new growth came out? What’s your watering schedule? How often? Water only or with nutrients?

Personally I’d let the pot dry out almost to the point of the plant wilting and then give them a good watering with 6.7 pH water only until you get about 1/2 cup of runoff.

[F10werChyld]

Thanks duckman, they are about 7" tall in 4" pots. Thank you Obi-Wan! All plants are the same passion fruit seeds from a reputable breeder in Holland. The problem started with the 4th set of leaves - when they sprouted, the first set started discoloring, then the 2nd set started going. I water with only water so far, and every other day is when they seem to want it. Ima let them go a little dry and try that route - thanks again.

[Obi-Wan]

Ok, if everything is equal, same seeds, soil, and watering practice, I’d put my money on a bit of a root issue in the 2 that are showing yellowing. I assume that the pictures you posted are of the same plant? The first set of 5 finger leaves is showing a bit of a deformity at the tips. This could be pH related or genetic but the combination of symptoms leads me to believe your issue is a soil pH that is out of the ideal range.

[duckman]

yeah, I'd get them out of those pots, F10werChyld, if you're getting rootbound it can mimic pH or mute problems...good luck!

[smoorman]

Obi-Wan "Personally I’d let the pot dry out almost to the point of the plant wilting and then give them a good watering with 6.7 pH water only until you get about 1/2 cup of runoff."
Why 6.7pH?

[Obi-Wan]

smoorman It’s recommended to water in soil between 6.5-7, 6.7 is a good halfway point. Without knowing if the pH is too high or too low, giving a good healthy watering at 6.7 is the best approach to putting it back in range.