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Which is a whole new ballgame for beginners.EDIT: Could also be something living in and eating your stems from the inside, I suppose. But when that's the case, people often (eventually) discover the actual creature.
Take a photo of the plant and another photo zooming in on, or a close-up photo, the damaged area.I use 1/3 tap water and 2/3 osmosa water... How do I check if I have magnesium and calcium deficiency?
I was going to make a new thread but will just piggy back on this dead one. Back story....same strain different phenos...coco soil organic blend..clones that are 1 month from cutting. Treated exactly the same. The hollow one is the best out of 100 so far during the veg round of cuts...it grew 12" in two weeks from transplanting from cubes.How hollow? The comment about it causing cuttings from the plant to decay and die instead of root causes me to think "drinking straw hollow." Can be indicative of insufficient calcium over a (relatively) long period of time. You've posted this thread in the "Coco Growing" section of the forum. I assume that was done on purpose, and done because you use it for your substrate/medium. So: After initially hydrating and rinsing your coco coir, did you pre-treat it with something like a calcium nitrate solution, one of the "calcium + magnesium" products, et cetera? Did you allow it to dry out at any time afterwards, while the plant was growing in it? And... all cannabis plants use a lot of calcium; it's probably #4 on the list of elements, ranked by consumption - but are the ones that you're seeing this issue in known as "hogs" in that regard?
Are you using tap water, which generally has some calcium in it? If so, has it been through a water softener (which removes calcium (Ca2+) and magnesium (Mg2+) ions)? Water that has been through a water softener is not recommended to be used on plants. It does this by replacing those ions with sodium ions, lol, so it's not really something you'd want to drink, either, especially if you have high blood pressure, a history of heart attacks in your family, are on a low-sodium diet, et cetera. Or do you use distilled water or water that has been through a reverse osmosis device? Those don't have any calcium (etc.) content.
Finally, are you seeing the classic "mosaic patches" of necrotic tissue on the leaves, which is a sign of a more extreme calcium deficiency? When it gets that bad, the gardener usually notices and treats it by adding one of the aforementioned products, at least until no more of those things are appearing. But not necessarily enough to really supply sufficient calcium to the plant, long term.
There are other elements that, when not present in sufficient quantities, can lead to hollow stems. Boron is one, if I remember correctly. But that's more rare.
EDIT: Could also be something living in and eating your stems from the inside, I suppose. But when that's the case, people often (eventually) discover the actual creature.