This is the time of year you will find out if you have any soil borne problems with your bonsai trees. The time for repotting is from around October through to March for broadleaves and into April for evergreens. Tropical bonsai are generally repotted when it is slightly warmer so later in the Spring but again it does depend on how you are keeping your tropicals.
However, the many people in the UK tend to repot in February and March but it does depend on your location, tree species and frequency of repotting and the root development of each bonsai tree.
It is worth checking the roots of the trees annually if possible to check for such pests like Vine weevil larvae or Leather Jackets as these can be very detrimental to your bonsai roots if left un checked.
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