It appears that the lower leaves on all of my plan...

Hi, if it is little black spots it should be Thrips (little pretty harmless insects that eat some leaf but dont do too much harm if they dont become too many) you want to try some yellow sticker traps or lady bugs if it is them. They hide on the wet soil

At various stages of growth the plant will need different things in different amounts . You have a deficiency here for sure that needs to be addressed . You can adjust the amount of PK your giving your plants and this will help you get back on track . With that being said the plant my be being locked out due to over feeding . When you feed your plant with nutrients its important to only feed them with the nutrient additive solution you mix every 2nd or 3rd watering this way you can ensure your plant uses up most of whats in the soil before adding new nutrients to it . This will also help prevent lock outs and calcium build up on your roots . Now with that being said I would advise that you only water with PH corrected water for a few watering to see if its a lock out or a deficiency . If your plant continues to worsen then its a deficiency if you see it start to improve then its was a lock out . When you resume feeding with nutrients I would advise that you start from 1/2 strength and work your way back up as needed . I've also noticed that your pots are only 1 gallon . Odds are you are root bound in those pots and so when you feed with nutrients it can burn the roots leading to what we see as nutrient burns . It's important to understand that the roots of a plant need space and that once they run out of space you will notice a few things like lack in growth the buds arent getting any fatter or nutrient burns . Its a little to late in the cycle to fix this issue now but at least you know for the next time .Other then that you are well on your way to getting some nice tasty medicine !! I hope this information helps you on your quest to becoming a grow master ! - Happy Growing!

Hi @NastyYeti! Yep this sounds like a serious deficiency, but in my opinion it's not a lack of nutrients, it's the opposite: a lockout. Indeed, I think you overfed that baby for quite a long time. In soil, you shouldn't feed everytime you water, nutrients just can't be flushed that easily and they tend to accumulate (salt buildups). Now that your rootzone is flooded with salts / old nutrients, roots are unable to manage N/P/K/Cal/Mag intakes... In this situation I would flush the medium for a few days with plain pH'd water (but no RO water, tap water will be good to restablish a good cal / mag balance), then see how it goes after a few days. If she still needs to fatten up / produce resin, then go back to a very light nutrient regime. Hope this will help, keep us up-to-date and happy growing 👊