What's happening to my lady?

[FunkyBuddha]

Hey everyone!

All my ladies are 70 days old today, but 2 out of 7 are showing these symptoms. As you can see the leaves have brown spots and are curling upwards a bit, but there's only a few leaves on the two affected plants. I'm growing in 11.5L pots (with drainage of course) in Plagron Terra Lightmix and I'm using the Plagron Terra nutes (bloom 4ml, pure zym 1ml, and green sensations 1ml).

The average temperature is between 20 and 26 degrees Celcius, and humidity swings between 35-55%. I water only when the soil is dry (I weigh by weight and by feeling the soil with my finger about half an inch to an inch deep) and I give 1L per plant. I pH my water with concentrated lemon juice to 6.3-6.8. I'm using a Spectrabox Pro 5 270 (173 actual watt output).

I was thinking of flushing the affected ladies when the soil's dry enough, and measuring the pH of the runoff to see what pH the soil's at. I thought it was a CalMag issue at first, but since the affected leaves are higher up in the plants it doesn't make sense since they're mobile nutrients and I couldn't find anything definitive, but now I'm thinking it may be a pH related issue? When I used the GrowWeedEasy diagnosis tool it says it's caused by overwatering, but I don't water until the soil is dry, and I don't water more than every 5-6 days, and up until last week I was only giving 1L, and then with their last feed I gave them 2L. I've ordered a bottle of BAC CalMag just in case it's a CalMag deficiency, but I'd love to hear you guys' input!

 

[Sleeper143]

I’d suggest a P deficiency. As she’s flowering she’ll be gagging for P. Probably caused by ph in soil being too low but could be a lockout from too much Ca.

Flush, ph check and refeed sounds like a good plan.

 

[FunkyBuddha]

I’d suggest a P deficiency. As she’s flowering she’ll be gagging for P. Probably caused by ph in soil being too low but could be a lockout from too much Ca.

Flush, ph check and refeed sounds like a good plan.

Thanks a lot! I just flushed the two affected ladies and measured the runoff, which for one was at 6.5, and the other at 6.2. Should I go ahead and feed them straight away, or wait until the soil dries out?

 

[Sleeper143]

Thanks a lot! I just flushed the two affected ladies and measured the runoff, which for one was at 6.5, and the other at 6.2. Should I go ahead and feed them straight away, or wait until the soil dries out?

Ok, not sure on your medium, is it a soil? If so you want the ph up between 6.2 and 7 for P uptake. If it is soil, now you’ve flushed, I’d water with your bloom nutes and some CalMag, water just till run off starts so you know your soil is full with your new, correct PH water/food. I’d aim for ph of around 6.5-6.8.

 

[FunkyBuddha]

Ok, not sure on your medium, is it a soil? If so you want the ph up between 6.2 and 7 for P uptake. If it is soil, now you’ve flushed, I’d water with your bloom nutes and some CalMag, water just till run off starts so you know your soil is full with your new, correct PH water/food. I’d aim for ph of around 6.5-6.8.

Yeah it's Plagron Terra lightmix. I'll give them a dose of bloom nutes, I'm still waiting for my CalMag to come through the mail (I live in Belgium and getting these things delivered takes like 2 weeks) and I'll just skip the pure zym/green sensations.