These seedlings are over 1 year old,often have 4 to 6 leaves as many as their roots.You can repot several seedlings in one flowerpot,usually 2~3 plants in a 13cm(in diameter) flowerpot.Now,the air temperature should better be about 20°C.When it is in summer and very hot,you should water the seedling in the morning as well as in the evening,so that the media in the flowerpot can keep a good humidity.And now you can also fertilize the seedlings,but the thickness of fertilization should be very thin.
