It's either improper watering or manganese deficiency.
Check your soil and see if it is really dry or soggy. If your soil is fine, grab some langbeinite and use it accordingly.
I hope this helps.
If I'm not mistaken, this is the beginning of a potassium deficiency... the white will turn yellow/brown and crispy as it progresses. Potassium deficiency delays bud formation, and decreases bud size, weight and density. If the plant lacks potassium in its flowering stage, you will have skinny and poorly developed flowers.
You don't have any information on the nutes you're providing but I would increase your bloom nutes to provide more of this important nutrient. If you're growing organically, you might want to add a banana tea or some bone meal... this will also provide good potassium to your plants.
I'll disagree with my growmie here in that a pH of 6.0 is just fine - but I would make SURE it IS 6.0. If you use a pH pen, you might want to recalibrate it just to be sure it's reading accurately. If you're using either drops or little strips, invest in a pH pen as those two methods are highly inaccurate (and a pH pen is an invaluable tooll to have in your arsenal!). Also check the pH of your runoff - this will tell you what is actually going on within the root system as far as the pH is concerned...
Good luck!
High sompas,
I am 100% sure that this is a potassium dificiency. The cause of this deficiency could be pH issues or overfeeding. They both cause nutrient lockout but in this case it doesn't really matter what the cause is.
But it does matter that you can fix both of these problems with a good flush of your soil and I will explain you how you can do that the best.
You can do this flushing by slowly pour water pH 6.2 onto the top of the soil, allowing it to drain freely from the bottom of the pot. Pour slowly, so the water doesn't overflow from the top of the pot. Use approximately four times the pot's volume in water to flush the soil. For example, use 1 gallon of water for a 1 quart pot.
After the flushing you need to let the soil (almost) dry out completely.
From there you can start giving water with pH 6.2 and start with 75% of the nutrients that you gave before to make sure that you don't overfeed them. I do think that 75% is more then enough for the rest of your grow till harvest. More nutrients is not always better!
Happy Growing! π
