Mildew on fabric pots?

Without the color, it is difficult to tell which kind of mold this is. Over watering will bring mold. Afterward, it is impossible to remove. What I do is, I use beneficial microbe call Trichoderma harzianum. Mix and water the plant with it. This type of microbe eats the bad microbes. It is a symbiont to plant. So you don't have to worry about bad mold aggrevate allergy or ruining your plant.

Hey 👋 Sometimes it can be mold...but more often than not its usually a calcium buildup from the water. Think of everything passing through those fabric pots, from the plants, water, air...it can get pretty messy after several weeks of growing. You can spray the outsides of the pots with a mild water/peroxide combo or water/dr bonners soap(they sell it in grocery stores etc, a good solution for bugs too), and just gently wipe down the pot with a rag. You can even just wipe the pot each time you water too with just a wet rag...and usually it'll pass. But I'd try a solution water spray 1st just in case there is mold living there too. Happy growing. ✌️

Try hydrogen peroxide (3%) that you can buy at any pharmacy. Mix a teaspoon into a gallon of water and foliar spay it across the pot, and water with it during your next watering. It'll kill the mold on the outside of your pot, and kill any within the soil and root zone. Repeat if it comes back. At this strength, its strong enough to kill mold and protect your roots but won't harm your plants (its converted to H2O2: water with an extra hydrogen atom. I wouldn't water with it more than once, unless you have a reason to, but its safe.

First, Use a air ventilator please or give them fresh air at least 2 times a day she needs that for no moho generation, Use baking soda For kill the moho or change the dirt for a new if the auto is a big plant yes, but if it small dont do it She will be fine.

sorry... mold or the like would feel fuzzy/soft. If nutirents, more like the build-up you see with hard water but from hard water+nutes likely. I bet it's nutes.

Thats from your water.. No worries. You should see mine at the end of a longer grow, lol. had some problems that caused a delay in 3-gals... ended up with a 1/4" ribbon of roots portuding through the lower 4-5" of pot (hempy-like setup). Definitely got rootboung but couldn't tell above ground. Spent 20minutes pulling roots out at end and thoroughly rinsing the pot -- still the nutrient build up, albeit much less and perfectly safe to re-use if well-rinsed. I wouldn't attempt to remove it with anything that even remotely agitates the soil inside. The benefit would not outweigh any potential risk of a cost. Gently running your hand over it might be find, but won't get it completely off. It will build up more as you go too. You'll possibly see roots sticking out at some point too. they'll air-prune themselves, but you could cut them, i guess? Like above, i don't think the benefit would be worth it, though.