First indoor grow, second overall

Mg

Hey 👋 I do agree, you are over feeding… I found a page with most popular deficiencies & methods to help… more specific: I guess you are lacking iron due to to much nutrients in your soil. Maybe following link will help: https://sensiseeds.com/de/blog/wie-man-die-sieben-haufigsten-defizite-von-cannabispflanzen-anhand-von-blattsymptomen-erkennt/ Hope this helped 👊🍀

Hey Growmie, From the looks of that new growth turning yellow (starting at the tips and spreading), it seems like you're dealing with a nutrient issue, but not from underfeeding, more likely over-fertilization or a pH imbalance causing nutrient lockout. What’s likely going on: Nutrient Burn: The fact that it got worse after upping the feed is a strong sign you're overfeeding. Burn usually starts at the tips and creeps inward. pH Lockout: If your pH is off (especially too high), your plant can’t absorb key micronutrients like iron or zinc , even if they're present. Iron Deficiency Symptoms: Yellowing new leaves with green veins is classic, and again, often caused by pH issues, not a lack of iron itself. What you should do: Flush with clean, pH-balanced water (6.0–6.5 if you’re in soil) to clear out excess salts. Check your runoff pH if it’s out of range, that’s probably the root cause. Ease off the nutes for a few days and monitor. Next feed, go with 1/4 to 1/2 strength max. Make sure your temps and airflow are on point. Environmental stress can make it worse.You’re doing the right thing by observing and adjusting, just gotta dial it in. Keep a close eye on the new growth over the next few days; it’ll tell you if you're back on track. Happy growing!

remember drain readings are not precise as to what is in the medium. It correlates. If you don't have a baseline of 'normal' when things are going well, and not jsut in short term, then it's not entirely useful data. If it's consistently moving in one direciton that is useful info and something to react to or a reason to constitute substrate differently etc etc. Looks a bit overfed, so i'd dial back that first before doing too much. could be related. Nothinng is getting locked out at 6.7, but overtime if you overefeed one nute too much you can cause lockout. It may take a few days... it may take a month... depends on the degree of overfeeding of that specific nutrient. The truth willout. The balance of what you feed over time will cause symptoms eventually if it is poorly balanced. This is fairly common with marijuana branded stuff in my experience. Some companies are more sociopathic than others when it comes to getting you to buy more of their product than necessary. If their feeding schedule has a ton of dependence on regular flushing, it's probably just to cover up their lack of effort/knowledge, lol. This isn't foie gras. You can't force feed a plant. https://www.cannagardening.com/sites/united_states/files/2024-02/downloads-grow-schedule-terra.pdf one-part fertilizer that clearly isn't well-balanced to use on its own. also, they don't freely give infor about npk values or percentage of other ingredients.. so there's not much to do here but speculate with such a lack of information available from the company. if this is the 'soilless' canna substrate product, it probably comes with a light pre-charge as described but you treat it like soilless in long-term meaning you provide 100% of the nutritional needs when you fertigate. Fertigate every time with 10% runoff and if it's well-balanced you shouldn't run into issues too often. you'll run into some oddball plants occasionally but it should be rare. i'd look up the ratio/levels of nutes in otehr soilless products - cropsalt, jacks 321, megacrop, masterblend, soouthern ag... it's no accident that whne mixed these all have very similar profiles. Also, the pre-charge in promix hp/bx have nearly identical ratios, except for K. these companies are not copying each other.. they are usingn the same base of knowledge, though. It is no coincidence. These products will work better out of the box as instructed than 99% of esoteric marijuana branded stuff. *Trial and error is always necessary even for the stuff that works better as instructed* But, if you can get teh gaurnateed analysis info from your canna terra 1-part fertilizer, that could go a long way to help diagnose what's going on here. It'd probably stand out like a sore thumb. 'Purple' could be from cold temperatures (likely with lights off) or maybe genetics.. . if it's a blue hue in foliage, that could be low P. not sure basedd on description and i don't see it in pictures. Long purple streaks in stems (not petioles!) could be low S, which also can cause some tip 'burn' too. Again, that can be genetics too - the purple in stems or exotic purple pigmentation elsewhere. several different things can cause tip burn - both toxicity and deficiency. So, more info is needed there. If it progresses around the serated tips, i'd look into K levels. how it progresses can help eliminate possibilities. Grab a marijuana leaf symptom chart from a simple google image search The good -- looks pretty slow moving, so the formula can't be off by too much.

stop using CalMag or cut it in half u're giving it too much so plant got lockout issue

It sounds like your plant is experiencing a nutrient uptake issue, likely tied to slightly high pH and possibly a potassium or magnesium deficiency. The yellowing and browning of the leaf edges at the top of the plant, along with purple shading underneath, are often early signs of potassium deficiency or a magnesium-related issue, especially when new growth is affected. While purple coloration on the stems can be genetic, if it's accompanied by other symptoms like edge burn or slow growth, it could also indicate stress. Your drain EC of 1.8 is on the higher end for soil, and combined with a runoff pH of 6.7, it’s possible that some nutrients, particularly magnesium and potassium, are being locked out. These nutrients are best absorbed closer to a pH of 6.3–6.5. Since you're using the full Canna Terra line along with CalMag, you’ve got the nutrients covered, but slightly lowering your feed pH and ensuring your lights aren’t too intense on the upper canopy could help the plant regain balance. If the symptoms continue to worsen, a slight reduction in nutrient strength and a closer look at environmental factors like temperature and humidity may also be necessary.