Ficus sofferente

Question: why do the leaves of my ficus turn yellow?

hi I'm Michele from Brescia, I repotted a ficus and fertilized it immediately after, now it has yellow leaves and I'm afraid of losing it. how can I save it?

Ficus sofferente: Answer: cultivate ficus

Dear Michele,
indoor ficus are plants of Asian origin, used to living in rain forests, or in tropical areas, characterized by a mild and humid climate. In nature they grow like large trees, and they need an excellent insolation, even direct sun if possible; clearly, if you do not live in an area with very mild winters, such as Sicily or Liguria, your ficus will necessarily live at home, and therefore in an area characterized by good brightness, but not by so much direct sunlight. So, when spring arrives you can move your bonsai outdoors, avoid placing it in an area with many hours of direct sunlight, which would otherwise burn the foliage. The shift to sunlight must be done gradually, or, to avoid that the conditions of outdoor cultivation are very different from those that can be had at home, it is advisable to keep the plant in a bright but semi-shaded area, possibly with few hours of sunshine, during the coolest hours of the day. The loss of the leaves could simply be due to a problem of this type, completely unrelated to repotting. Or, given the warm temperatures of these months, if your ficus is at home, but you have turned on the air conditioner, it is suffering due to air drought; the ficus fact can survive even weeks without water in the ground, especially if kept in partial shade; but the air in which they live must always be very moist. When the heating system or air conditioner is active, the crown must be vaporized often, to increase the humidity of the air.
The problem could also be related to repotting: when we repot a bonsai plant, we generally also plant the roots; if this pruning is very drastic, the plant can suffer from it. Or again, the new soil that you used for your bonsai could already be fertilized (as is the case with the soil in the nursery bags, but also for the akadama); when we repot a plant with a top-quality soil, we are already fertilizing it; therefore for about a month it is not necessary to provide additional fertilizer, the plant will be content with the one present in the growing substrate. So your plant could suffer from over-fertilizing, some additional watering should solve the problem.