at home I have a pachira despite being careful with the water I noticed that some trunks in the lower part have become ragrinziti and I think there is a bit of muffettina besides it hangs me in a showy way from a side.le leaves are beautiful someone just barely has changed color is it the case to repot it? how and when? how should the vase be?
Thanks in advance.
the pachira is a tree that lives in the humid areas of Central and South America, particularly in Guatemala and Brazil; there are about twenty species, although the one that is usually sold in European nurseries is pachira aquatica; it is a real tree, which in nature can reach 15-20 meters in height, but if cultivated in pots, even if it reaches the two meters without problems, it generally tends not to develop further, since the presence of the container , which inhibits root development, tends to keep the plant smaller. These plants, in nature, can enjoy a tropical climate, characterized by a warm and humid climate, more or less throughout the year. It is therefore cultivated in apartments, even if in winter it could withstand temperatures below 5 ° C, and even short frosts, which cause the foliage to fall, without however damaging the branches; only in the regions of southern Italy it is possible to keep a pachira in the garden throughout the year, taking care in any case to cover it during the autumn and winter months, when the thermometer drops excessively. So, you are right to grow your plant in the apartment, but perhaps the watering was excessive, as shown by the presence of mold on the substrate, a clear indication of the development of rot, which tend to grow only when the soil has been left long wet , and therefore in a moist and oxygen-free environment. To avoid that the rot also involves the plant, it is the case to repot it, changing the whole earth, to avoid that the mushrooms contained in it are moved also in the new pot; if your pachira is already in a nice large vase, it will not be necessary to replace it, just change the soil. Then extract the pachira from the vase, and clean the roots from all the soil; if you find dark or ruined ones, cut them with a well sharpened and dusted scissor with a broad spectrum fungicide; then repot the plant, using a good universal soil, mixed with little sand or perlite, so as to increase drainage. At this point, after a few days, provide the first watering, mixing a systemic fungicide with water, or a fungicide that can penetrate the pachira tissues through the roots, in order to prevent future fungal attacks. Remember to water the pachira regularly, from April to September, so that the soil remains fresh and moist, but not soaked with water. During the autumn and winter months, on the other hand, it is sufficient to lightly wet the soil sporadically, only when it is well dried; rather it increases the humidity around the plant, often steaming it with demineralized water, even every day.