When a tree dies or has to be taken down for other reasons, the temptation is to cut it down close to ground level and then leave the resulting tree stump and its roots in the ground. It’s a lot easier, quicker and cheaper than digging it out!
However, it is a much better option to remove the stump, as they can lead to other problems.
One problem of leaving behind the stump, is that it can produce suckers – new shoots and stems arising from the still living stump. These can arise several feet away from the stump, and interfere with other parts of the garden.
Although a completely dead stump can no longer produce suckers, it can become a host to the difficult to control honey fungus disease. Once in the garden, honey fungus can spread to living plants, which will kill them.
As a result, it is far better to remove tree stumps.