Scharze und braune Flecken auf den Blättern

Danke für die vielen Antworten. Ich vermute auch, dass es sich hier um einen Calcium-Mangel handelt. Die Dame steht in Living-Soil, dass heißt einmal füttern und dann nie wieder. Ich hatte es ein wenig damit übertrieben und konnte dann nichts mehr ändern. Deswegen war sie so mit N überfüttert. PH wird durch die Living-Soil eigentlich selbst reguliert, aber dennoch achte ich darauf meine Pflanzen mit einem PH zwischen 6.2 und 6.5 zu gießen. Der Schimmel war nur partiell und kam von außen (nicht durch einen nassen Topf oder verfaulte Wurzeln). Danke für euren Input

If you had mold theow away the plant and get a dehumidifier. The spores are everywhere and not good for your health.

There are a few potential reasons why your leaves might be turning purple, but there's no need to worry. First, it could be due to genetics, although it's important to note that not all plants from the same seed exhibit this trait. Second, extremely low temperatures below 20°C can cause discoloration, but your temperature is a bit higher at 22°C, so that's likely not the issue. Lastly, it might be a phosphorus deficiency, which can be addressed. As for the timing of flowering, it appears you're in the late flowering stage, possibly already in the flush period. At this point, there's no cause for concern, and there's not much you need to do. Just relax and enjoy the process, as you're likely just a week or two away from a successful harvest 🍻🍻

At this stage of the growth it looks like a Potassium deficiency. See here the Canna Potassium deficiency guide : https://www.canna-uk.com/info-courier_potassium

the 'that's not mold' is only in reference to the spot shown in the picture here... just incase it was misunderstood. def cut out any chunk of plant with mold on it. that was a good choice.

as i look over last couple weeks, i'd think it is lockout of some sort. The plant gets extra lush over that time, a sign of overfeeding.

that's not mold. it's tough to know if it is a deficiency or too much of something else locking it out. Ca deficiency is usually a lighter color. P-def can cause purple-to-black spots, but you'd also probably see soem blueish hues in leaves, which i do not see in the pictures. Mg can have dark spots like that, but should coincide with interveinal chlorosis. too much p or k can cause these symptoms, too, due to locking out that molecule despite it being present in the plant and at proper levels. This one is complicated. check pH, make sure it's in a good range. look over how you have fed it the last month or more and make an educated guess.