Your bonsai plant will be beautiful and healthy throughout the year with your correct care. Bonsai trees are just miniature copies of the large trees and that is why they have big changed in their appearance with the season changing during a year. And every season require some other type of care and your care should change from season to season.
Spring is the most active season for bonsai tree care because it brings the signs of growth and your bonsai tree wakes up after the long dormant period of winter. It is a tradition in the gardening that spring is the busiest season of the year and all the gardeners know this.
Springtime is the right period for your deciduous bonsai trees to repot it and to prune their branches and roots. The optimal time for repotting is the late winter but you can do it in spring too, though the main rule for this that you should repot your bonsai trees before their first buds break.
Pruning is done at springtime too as every dead branch is seen quite well before the foliage hides them. Cut down the new shoots too. In case you are growing coniferous trees, you should think of the wires and remove the old ones if they hurt the bark of the bonsai plant. But do not apply any fertilizer during spring months because this season is not for this and can be harmful to the roots of the tree. Never fertilize your bonsai in spring.
The maximum bonsai growth you see in summer. Late winter and early spring must be used for pruning and repotting but sometimes you can trim or prune the shoots growing too rapidly. Cut the shoots on deciduous trees to one or two pairs of leaves.
Summer is recommended for wiring your bonsai. You can shape it and train and remove the previous wire if your tree is already in its desired shape already.
The soil should not dry badly and you must control it regularly. If it is very hot, water your tree every day, and maybe twice a day. In summer you must fertilize your tree as it needs more feeding at this period.
Bonsai trees slow down their growing processes in autumn and it is not good to prune the tree during this season. Give your bonsai some rest in winter and remove any wire from the trunk and branches. You should give your tree little water when it is bare and just entering the period of dormancy. But if you grow conifers you should water them regularly but lesser than during hot summer. In the middle autumn fertilize your bonsai again.
Your plant will not require much care in winter, just water them sometimes.