Need some help again..........PLEASE!!

Week 3 of flower growing outdoors in pro mix and megacrop nutrients about once a week. Leaves started yellowing and dying, I don't know what's wrong.



Any help is greatly appreciated.

bump

I’m not real experienced but I wouldn’t necessarily freak out about it. It seems like it’s the older/bigger fan leaves that are most affected and they seem to be the ones that get yellow and die off first. Might be some insect or sun damage contributing to it. Then again, I’ve got mine in the soil and they’re quite a bit bigger so I’m not sure we’re compared apples to apples.

Anyway, my point is, it’s probably not something that’s gonna totally kill your plant or destroy the crop since the other leaves look healthy and we’re close enough to harvest time anyway.

the whole plant is affected.

Genki88 said:

the whole plant is affected.

Click to expand...

Had the same issue, I was about 3 weeks into flower as well and all 5 plants were yellowing like crazy. The issue was I was only feeding p and k. I stopped the N to early. I gave them a nice dose of N and a week later they were all nice and green again. They just need a little early on to get them through the flower. Now I’ll let nature take its course and let them yellow until harvest time. Also I’m outside as well up in Massachusetts. Harvest time might end up being early this year thank god, might not have to be overly worried about bud rot or frost this year.

Since we don't know how you are feeding them I would guess they are light on nutes or the PH is out of whack. Is that one plant? If you had multiple plants you could be experimenting with different nutes to see which ones worked better. If you would have mixed some dolomite lime in the pro mix that would help keep the PH in check.

With Megacrop they recommend increased doses in their feed schedule for flower
Your plants will be fine even if you are too late too correct the nutrient issue

First you should know your PH, maybe your plants are leaking of specific minerals because the ph is to high or to low, but...

I would suggest to get some CAL&MAG (some of them already have som N, enough for flowering). I would start by flushing the pots, make sure that there is no salts buildup, let it dry, then give some cal&mag, and the regular P K solution you may use.

I recommend you to get a good EC/PPM meter, or search if your local water is hard or soft, because it makes a lot difference, for years i had similar issues to yours on middle/end of flowering, when i used soil back on the day, because my city water is 80-150ppm, so there is basically no CAL&MAG.
Even today i give CAL&MAG during flowering (first 5-6 weeks).

The water here has a ph of 8.4 and ppm of 400+ and I ph the water to 6.3-6.8 using a bluelabs ph pen. I will add some calmag next watering, thank you so much for the advice.