Golden brown spots on lower leaves and spreading t...

Hi bro, you're having pH fluctuations, adding some cal/mag could help but the most important thing to do is to check your pH everytime you feed them. Reading and adjusting the intake pH will help your plants to absorb nutrients when the appropriate range is applied (6.0-6.5), and prevent any deficiencies.

Based on what you said here, "Partied from Friday until Sunday night and didn’t feed the plants for two days. They were bone dry so I’ve upped water to 1.5 litres every other day. They’re definitely drinking it. Also noticed some golden looking blotches on lower leaves, smaller ones appearing on the next leaves up. Could this have been from letting them dry out or them not getting enough nutrients?" I'd say she had a toxicity build up due to lack of water. My theory, from observation, goes that if they get too dry, toxins cannot be got rid of by the roots so they go into the part of the plant next up - the oldest stem fan leaves. A good water with clean water (48hrs aired tap water will do) should help clean a lot of toxins out, but the damaged part of the leaf won't recover. The best to look out for is a marked delineation between the damaged part of the leaf and the green healthy part of the leaf. The better the delineation, the healthier the plant has then become imv. After that clean, let her dry (but not too much this time!) then a good ph & ec feed.

Firstly check the ph and EC of the runoff , this should be between 6-6.5 (ph) and 1.5-2.5 EC , the normal culprit for spotting / camouflage pattern is cal mag deficiencies, if you look at my sea of green diary you can see the difference adding cal mag makes 👍

Hey there so I see you mentioned the spotting, so I looked at week 4/5/6. I see you mentioned removing the spots, also that you've flushed well, have the spots returned? I see the buds are really taking off and that you're also having leaves that look slightly taco-ed, I believe HID put off strong heat? Could your plant be having a bit of heat/light stress? I know that can cause spots as well as other leaf symptoms. Possibly if youve done the other options water nutes etc, and the problem is still there, it may be heat/light if so up the airflow with a little fan or 2, maybe lower light to 18hours and or move light slightly away if possible. Hope you're just having a short problem, I expect your buds will get to the end nonetheless...but its always nice finding out your problems to learn for next time.. Happy growing.

These tiny insects generally hide on the underside of leaves and along stems. ... Fungal diseases also can cause brown spots on plant leaves. Removing the infected leaves, avoiding wetting foliage when watering plants' soil and increasing air circulation around plants typically takes care of fungal diseases to a degree. If its only old growth affected, I wouldn't worry too much. Hope this helps.

Well you are following a set feeding schedule, Tang's. But what kind of soil are you using: light, heavy / all mix? And I don't see you measuring pH nor EC/PPM. For a 20 liter pot, you sure started feeding early, even if it's light mix. Besides the golden spots, you also have leaves with curling edges, which make me think of nutrient burn, either because you are feeding too early, too strong a solution or too often (or a combination of the three). Give the plants plain pH'ed water for a week or two, you might even want to do a mild flush.