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Hello, I suspect i have run into some problems, I am growing a few strains. the first is my kings kush hybrid: yellowing leaves, pistils look like they're eaten off or gone, prematurely turned, one of the ladies has nearly it's whole stem colored redish-purple, some yellow leaves have black spots, a gradual yellowing ( the veins seem to yellow at the same pace as the rest of the leaf) I've been feeding them black strap molasses and beastie bloomz. All are in different stages of flowering, outdoor in ground.
Next up is my bag seed plant, I recently sprayed for mites and caterpillars with ecentria i3 (rose mary oil mainly) and spinosad. Next day i came out and the bottom was all fucky. wilt and weird colored spots. it's had ither rams horn or claw leaf for a few weeks. I thought it was the spray but i also sprayed all my others with the same stuff and this is the only plant presenting this problem.
and lastly, my stinky pinky. it has weird rusty spots forming between the veins, rams horn or claw?
possibly, I would check the ph but i don't know how to use the product i have for outdoor. it's a liquid test kit called ph up & down. the ph of my tap water is 8.
Yellowing starting at the bottom tends to indicate low N. However, as flowering progresses it's normal for leaves (especially the larger ones) to start turning yellow.
Purplish stems can be low P, but also cold temps and genetics can play a role.
As for fertilizer be sure to know if using potting soil what's in there, or if in ground (or using this soil in pots), as you say yours are, to run a simple and inexpensive test that you can get at many stores to get a general idea for N, P, K & pH. For instance, if you already have high soil P, you probably don't wanna be giving it much of a high P fertilizer.
also, know that water you're using. If distilled or rain water not too much going on here, but in my case tap water has high Ca and Mg, along with some Cl and SO4, and pH little above 8.
Knowing this stuff before you start the growing season will allow you to plan/do accordingly, and nutrient issues shouldn't be too big a problem.
P.S. Find a good source to look at pics of symptoms of toxicity and deficiency for all the nutrients to see if you can find matches.
well, it's a required plant nutrient, so unless it's really high in tap water probably not an issue, unless you use fertilizer w/a good amt of S already in it. You can always just use distilled water or collected rain water; i get the former from the dehumidifier. Further, I mix the two (tap with distilled or rain) sometimes to help with Ca and Mg, which in my case is 120-150 ppm (or mg/L) and 40-50 ppm, respectively.
If unsure, again, check with a cannabis specific guide for symptoms of too much or too little of all the nutrients (micronutrients included). If it's pH that's not inherently a problem (i.e. it doesn't "burn" the roots), but rather too high or too low pH interferes with certain nutrients being available in the soil, so it would also be seen as a nutrient issue. So in other words, you may not need to add what the plant isn't getting, but correct the pH to enable it to be uptaken by the roots.
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Some of those lighter colored patches that seem to be random could be fungal or insect damage. Should look closely, under magnification... especially do this if it doesn't match any nutrient issues. Cannabis can take pretty strong doses of insecticides and/or fungicides w/o any problems. Nevertheless, what I do is have one plant that I'm a treatment ahead of the rest so if I do go too strong or apply something that the crop is sensitive to, it would only harm that one & then I'll know.
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