Dear Francesco,

the loss of leaves is always a worrying symptom with plants, and especially if this event occurs with a bonsai; to understand if it is possible that your bonsai will return as before (more or less) it is necessary to understand the reason for the loss of leaves; typically in indoor bonsai, during the winter months, the leaves fall due to stress basically due to two main reasons: – lack or excess of watering; in the first case the leaves first fold downwards, then lose their turgidity and consistency, then dry up and fall; in the second case the leaves fall due to the formation of root rot, which spread throughout the plant, the leaves turn yellow, often spotted black and then fall off.- lack of humidity in the air; Unfortunately, the climate in the apartment is far too dry for plants, especially in winter, as domestic heating dries up most of the air in the house. Even with ideal watering, provided correctly, the plant takes on a ruined, sad appearance and loses a few leaves; hardly in a case of this type the plant loses all its leaves.If your bonsai has been subjected to a prolonged period of drought, with dry soil, which has caused the leaves to fall, and despite this, when you have started watering the leaves again they have reappeared, it is very likely that it will recover completely and start to produce new leaves, often even smaller than those it had before; in any case avoid repeating the experience, which is not pleasant for your plant. If it was air drought, or general drought, due to both dry soil and dry air, remember to vaporize the foliage and branches at least every 3-4 days, in order to increase the ambient humidity around the bonsai; also in this case the leaves should start growing again. In the case of a problem due to excess watering, in order to hope to save the plant, it is necessary to completely eradicate the fungus that hit it, possibly repotting it, removing all the damaged parts of the roots, and providing a systemic fungicide, which will enter the sapling tissues, killing the parasite. Once this is done, the plant should slowly recover, but if some branches are completely threshed, try topping them, in order to encourage the development of new shoots. Also in this case, avoid watering incorrectly in the next few months (even in the rest of your bonsai’s life, but especially in the next few months) because it is not said that your plant will survive a second rot that develops shortly after the first. episode.