Oh we never got to discuss, the lower leaves that have started to yellow, this is on both plants I just checked. What is that cause of this? Is it senescence or unnatural? Also wondering if it has anything to do with the brown spots though its unlikely cause the 2nd plant doesn't have spots
ryan, if this is the coco-specific Canna nutes, you don't need additional Ca-Mg, it's boosted already in them,....too much can cause other uptake and pH issues,....
Hey Waira, thanks for the reply, I read before starting my grow that canna coco a+b lacks iron and that canna expects the water thats used to mix the nutes to have an EC of around .250, usually from tap. However my tap is around .8-.9 EC, so I decided to go with RO and grabbed calmag, Should I stop adding the calmag? You also mentioned its probably a Ca def but I thought I was adding too much Ca/Mg with the calmag. I seem to have been misled in reading that its okay to feed smaller amounts the first few weeks and that I didn't need to water to runoff cause i'd be "pouring my money down the drain", also read that you couldn't test pH and EC in coco runoff and that pH soil meters don't work in coco. Sigh, its hard to know what information is accurate or not when researching, thanks for putting me on the right path though. As for the pH meter, I don't even want to use that cheap thing again with it giving me wrong measurements and all. I haven't fed in about 2 and a half days and the pots are getting pretty light. I've been using the cal-mag bottle as instructed, usually ends up at around 150ppm but the other nutes I've been feeding at 3/4 strength(full strength would be too high(650-700ppm). I've been upping the ppm by 50 about every few days. At 550 right now. Got a batch already mixed but I don't have a reliable pH meter to lower. How come pH to 6.0 instead of 5.8? And yes its all by gallon because I use the grow guide on their website where you can fine tune all your variables. Its weird that the 2nd plant hasn't been having any problem with brown spots, since I've been feeding them both at the same time with the same feed. I did feed a bit more on the plant that's having issues for the first 2 1/2 weeks because it was substantially bigger at the time. They're the same size now.
...are these stand alone pots? If so, are you doing 15-20% run-off each time you feed? This is necessary to keep nutrient build-up from getting out of hand; you can't treat coco like soil it's behavior is very different from true soil, more like hydro; also you should be monitoring the pH and ppm/EC going in, and coming out, that's how you tell if the nute salt build-up is in check,.... coco has some odd CEC properties, so water alone is not recommended or it may screw up that cation exchange capacity which involves mainly Ca, but also Mg to a lesser extent,... it will bind to the coco and be kept from the plant until the coco is saturated and starts releasing it like it should,...
Symptoms look mild, early,.. probably Ca, but P defc. can do similar things at times,... all your feeds are per gal, not L? Is it what the bottle directions recommend? Seems weak per gal,...per L is m ore like it,... Do what you can for measuring pH, but if you grow coco, it's pretty much mandatory to use a quality meter and a TDS/EC meter too,... again, think hydro, without these, you're running blind and that will end up a shitshow every time, save sheer dumb luck,...
For the $, the Accurate 8 soil pH probe is the best for in-pot measurements, but if you're doing the proper run-off testing thing, it not really necessary,.... the cheap meters are crap, just like my mate Yeats' here says,... :smoking:
Flushing in coco is very different from soil/peat based soilless... If absolutely needed, you use RO/Di water, with 150ppm Ca-Mg plus another 150ppm nutes, pH to 6.0, and poured through until r-o is at or near input values,.... you are not there with this at all,...
Hey again. Got my new pH meter today, just flushed them twice, the runoff came out to 1350ppm the first flush and 1300ppm the 2nd. I'm amazed at how high the ppm has been just sitting in the coco, how come this hasn't completely destroyed my plants? I don't even see nute burn on them
