Also. The dots are from a neem application.
How did you come to this determination? I don't use
neem oil anymore, but have in the past. I never experienced anything like that with it. Without reading the
neem oil part, the first thing I think when I see those dots is a Ca def, but it is not a close enough picture to say for sure. I don't see any Ca knots where the leaf meets the plant stem, so, your plant isn't storing any extra Ca. Take a closer look for yourself or get a close up pic of those leaves.
Is there more than one color to the dots? Like a yellow center with a ring of red or brown around it? If so, that is for sure a Ca def.
In that second pic, it is showing signs that could be either an N or an Mg def. The interveinal chlorosis you see (the veins remain green while the parts in between the veins yellow) tends to be indicative of an Mg def. Mg is pretty important for chlorophyl production. It kind of depends upon how the yellowing progress. Did it start at the outside of the leaf blades and work its way to the center, or did the yellowing start at the blade tip and work its way back to the node? An Mg def can show up in more than one way, including a lime green type color to your upper growth. Also, N def tend to start on the lower part of the plant and then work its way to the top, which doesn't appear to be the case here, which is more indicative of a lockout due to pH, hard water or improper nute ratios (which usually goes back to hard water).
You at one time did have some pH issues for sure, indicated by those three bladed leaves and twisting tips (which can often go along with a Ca def/lockout), so the folks pointing to lockout are probably right. Lockout can occur for more than one reason. Incorrect pH, incorrect ratios of nutrients compared to one another and harder water that has a good amount of calcium carbonate and magnesiun carbonate in it. Any bicarbonates you have in your water will present an even bigger problem.
N & Mg def can be easily confused and it is not uncommon to have both Mg and Ca issues at the same time.
The big fan leaf in that first pic is showing some signs of a P def with the way that the edges are curling under - if this continues and the color goes to brown, you have a P def kicking as well, which, again, could be a lockout issue or simply an under feeding. The red petioles are also indicative of a P def in
some plants. In other strains, it is a genetic thing and not a sign of anything - don't know the genes you have, so I don't know if it is a genetic predisposition or attached to a P def.
Sounds like you already flushed, but if you do have a lock-out, it is best to use something like
Clearex to flush with and then run at least three times the volume of your pot in water. Meaning if you are growing in a 1ga pot, run 3ga through, if you are growing in a 5ga pot, run 15 ga through, etc.
Again, the question is one of a lockout or not enough nutes overall. Need more info to be more precise like feeding schedule and tap pH.
Are you using tap water? What's your water like? Do you know the pH of it? If you are using tap, it can have a high alkalinity to it which makes it more resistant to the pH dropping when you add acidic nutes.
How much below the recommended dosage have you been feeding?
I also see signs that the plant was over fed in earlier stages of life. Did you start heavier and back off a bit? If so, that could explain those dots as well.
That's a nice looking heavy sativa strain. Highly sativa strains can be real finiky bithces to grow and you are right to cut back on the nutes with such a strong expression of sativa genes. What strain is it?