I dont know what it is. But generaly speaking you need a free draining soil that doesnt stay wet, just moist. Your soil looks to be gardening soil or something similar. The particles are too small and through surface tension they keep the soil too wet. You need more info like species for specifics like when you can repot. When you can, IMO, you should change the soil to a gritty quick draining mix with a bit of organics to retain a bit of water without rotting your roots. And get it out in the sun asap, considering species and location. I hope that helps a little. Watering is a little hard to get right and hss everything to do with your soil make up. And soil make up is like pasta sauce, everyone has their method and mix. Lots of info is out there about soil make up and properties. Sometimes its refered to as soil wars! Good luck with your tree.

Looks like a conifer (Juniper perhaps?), so it needs to be outdoors (if your climate allows).

Ah, yes, that makes sense. Possibly Hinoki? Chamaecyparis?

Josh

I'm not sure, can anybody tell me anything about watering it ?

Chamaecyparis obtusa (commonly Hinoki cypress) - Josh got it first.

Irrigate until the entire soil mass is saturated and water flows freely from the drain holes only after the soil has dried down to the point it is almost completely dry. Repeat at appropriate intervals.

Al

Hinoki is correct. Right now I would say it's more of a topiary than a bonsai. This spring I would change some of the soil and replace it with a more of a bonsai soil and put it in a larger pot. Then I would start pinching the "balls" back moderately to hard to induce back budding. When you get a new growth closer in to the trunk grow them until you see where the new branches will take you. This will probably take a few years to bring it back to a bonsai. Good luck! :) HTH.

FWIW - Hinoki isn't a reliable back-budder. While it will back-bud, it usually does so with a good measure of reluctance.

Al