Looking after a horse chestnut tree
I have grown a horse chestnut tree/sapling from a conker. It is about 7 foot tall and has a lot of small branches on the 'trunk'. I guess these should be removed. If so, how and when, and are there precautions I should take?
This article has information about horse chestnut. It advises pruning in late winter. https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut/how-to-grow-a-horse-chestnut-tree.htm
No special approach to pruning, just cut the little branches off flush with the trunk, using a hand pruner or saw.