Answer: In general, it is always better to improve the existing soil rather than import soil. The reason for this is that the new soil may not be a good match to the existing soil and this can create more problems later. It is also never a good idea to change the soil level around a tree. They are very sensitive to this. Instead, add lots of organic matter such as rotted leaves, compost, or rotted stable manure and bedding and work carefully trying not to disturb too many tree roots. In addition, using several inches of an organic mulch year round will also help improve the soil as it breaks down over time.
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