Due to limited space, the soil contained in the pot should be replaced after some time. The time and manner in bonsai soil replacement are necessary done. Replacement of land needs to be done when visible symptoms are as follows.
The growth of plant roots in the pot too crowded. Already greatly reduced the amount of soil and roots grow coincide-crush.
Plants look skinny (not stunted, but because of lack of nutrients).
The new shoots grow very slowly, despite being given fertilizer.
Solid ground, hardened, and red or acidic.
Leaf color is not normal. Usually more pale, puckered, and not bright. The leaves are shiny, so not shiny and gloomy.
Replacement ground is very beneficial to growing bonsai. Fertile lands that are not replaced by a new, nutrient content is still good. Replacement of land also means rejuvenation roots. The roots are too much reduced in part to match the stem of the plant and the container they occupy.
Replacement land should not be accompanied by the replacement of the pot. During a pot still strong and in harmony with the plant and needed to be replaced. Long pot can be replaced with a new pot when the new plant is already no longer in harmony with the container. Many bonsai lovers who strive to increase the value and price bonsainya by replacing the pot with a new pot that is more expensive. The pots were replaced still be used to going bonsai younger age or newly acquired.
In general the smallest spaces, micro pores, contain water which, because of their minute size cannot be accessed by even the finest root hairs. The middle size pores, mesopores, contain water available to plants and air moves into these as the plant removes the water. Pores greater than about 0.1mm diameter, called macro pores, will drain to allow free air circulation within a short period after watering. Ideally there should be sufficient mesopores to ensure good retention of water but sufficient macro pores to allow free drainage, gaseous exchange and thorough root exploration.