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Depending on the type of plant that it is, then it could be the natural process. To be able to tell you I will have to know what plant that it is, or if I am able to see a photo then I can help.

Unfortunately, you don't say the plant's name. Nevertheless, all you can do is fertilize it if you haven't already done so this spring, keep the soil moist and wait. In about two weeks, you may see new leaves poking through. Plant roots are pretty depleted from flowering so leaving the leaves intact allows the plant to re-plenish roots and sustain the plant through winter. If new leaves sprout, there is enough time this growing season to do this. If no leaves sprout, the plant may wait until next spring. It will be weak and may not flower next year if this is the case. Only time will tell. Good luck.

Please try an internet translator; I don't understand the message as sent. Here is one example: https://translate.google.com

This is what is called gray water and has been used for watering since long before indoor plumbing. I think the key is to use very plain organic (no chemicals) soap like Castile or glycerin. Shampoo is another issue and I'd be hesitant there. I also would not spray plants with the gray water but use it to water the soil. Here is more info: https://www.gardeningknowhow.com/garden-how-to/watering/using-graywater-in-gardens.htm

It will depend on the plant that it is. All three of those factors could be a cause, but again, it would depend on the type of plant. Many are not as affected by those factors as others. Can you include a photo, and the type of plant? This can help me to identify what is going on.

Hello, you forgot to add which plant you are considering. Will you please add that info.