If the leaves of the Calathea or Basket Marante, which are also non-toxic to cats, turn yellow, this is always an indication that you have fertilized the plant too well. How to prevent the Calathea from getting yellow leaves.
Why does my calathea have yellow leaves?
Yellow leaves on a Calathea are usually due to over-fertilization. To counteract this, you should repot the plant, fertilize only every four weeks in the summer and do not use any additional fertilizer during the winter.
Yellow leaves of Calathea due to excess nutrients
The Calathea has little nutritional requirements. You must therefore be careful when fertilizing, as the basket marante will react to too much fertilizer with yellow leaves.
If the leaves have turned yellow, you should repot the plant immediately. Place them in fresh substrate that should not be too nutrient-rich.
In the summer, the Calathea is only fertilized every four weeks with liquid fertilizer (€6.00 on Amazon) in a concentration that is not too high. During the winter time she does not receive any additional fertilizer.
Tip
The Calathea does not need a winter break like many other houseplants. Temperatures in winter must not be lower than 18 degrees. There is a little less watering in the dark season.