Outdoor Disease Problems, help needed! :(

hello everybody,

I have this mysterious problem with some of my plants this year and everyone I know in the buisness couldn't come up with a legit answer, so maybe someone on here can enlighten me or has similar problems.

First of all the conditions:

Outdoor Grow, Latitude 53degrees North

Soil:
normal garden soil from the local gardening shop mixed with the soil at growing site.

Fertilizer:
couple of nettle teas, some valerian extract and a normal organic vegetable fertilizer in medium dosages.

so I have been doin pretty good last year with the exact same setup, but this year somethin seemed to be goin wrong.

I have 12 plants in pretty close range to eachother, and this year my three starbud siter plants (this strain has been performing very well for me last year at the exact same spot) started to get little brown spots on their leafs, I was sure it's not a bug and at that time it didnt effect the others that were standing right next to the "infected" plants, what I did was spray everything with neem oil to make sure no bugs are on there and I sprayed milk and very low amount of anti-fungial pesticides, no crazy harmful stuff tho, I swear, and of course all this was before they really started to flower.

so I have some pictures here and as you can see, these plants have been lookin like this for 6weeks and seem to still be growing and flowering, of course slower, while all the surrounding plants dont seem to have any symptoms or just very slight ones on the lower leafs.

I tried to cut off every leave on the starbud that was affected more than 50% but it came to a point where I would've had to chop em all, so I left em on there to see what will happen, and so far they havent completely wilted away...

also I'm pretty certain that I didnt over-fertilize them, because the problem was there before the fertilizer, but what do I know

I'm by far no good grower and hope someone on here can help me with a clear answer to this problem, and I know that it's too late now to stop the problem, but maybe someone has a good advice on preventive measures for next year, any help is much appreciated

also if there is any info that is needed to solve the problem I will try to provide it!

I probably wouldn't call it a disease, it looks like it's not getting the correct nutrients. You say this was the same spot you've used before, did you dig out old soil and put in fresh? If So How Deep Did You go? Sounds like your an organic man like I yam, I'm not going to tell u to add in nutrients because I'm not sure what your lacking, but if it were me, I'd try to mix up some blood/bonemeal and make a tea with it. How much is what I'm not so sure about. I'd also throw in some chicken poop, but be cautious, you don't want to shock it. If it hasn't spread to other plants, then it's definitely lacking something by looking at those curled up leaves.

thanks for the answer CapnD,

yes, I used new soil, only the surrounding soil is the normal growing site soil, I tried to place em in a different pattern this your to prevent something like that, I doug the holes about 50cm/1,5ft and put the plants in with normal soil bought from the store.

I could very well be a nutrient problem, but since I of course havent sprayed my plants with anti-fungals since they are flowering, now the others start getting this symptoms too, it's starts with the lower leafs and goes up, more slowly than with the infected starbud sister plants, I'm thinking maybe it's a fungus from the nearby cherry, apple or plum trees, I've read something about that being an outdoor problem...

can anyone point me to what kind of nutrients might be missing?!