You water bonsai as the soil starts to get dry. So.. Also when there are no leaves: You water when the soil starts to dry out, but before it really is dry.

If your plant drops it leaves every once in a while you are having an care issue. What species is it? Is it in direct rain? Wind? Sun? How do you care for it? (Naturally, you do not mean:It drops its leaves in fall, right?)

Hi leatherback, thanks so much for your reply, its great to know someone will help me. Actually I have it for 1 and a half years now and it did this twice: last year in july - exactly after i changed its position - i am suspecting that that was the reason. Now this year it did it in around october - so thats during fall yes, but last year it did not go to sleep in october (as i said it only did it in july), so was thinking that it is a bonsai that does not normally change leaves in fall, otherwise it will do it every year during the same time, no? I am a beginner so i dont know much. As its position, no wind or rain because its indoor, but its in direct sunlight (through a window) for a couple of hours a day but other than the two sleeping periods mentioned above, it looks healthy full of nice green leaves - so i was thinking the sun is not causing harm. Thanks alot!