Staffordshire,
United Kingdom 
My laburnum is between 35 & 40 years old - hardly ever been pruned. I now want to cut off a large branch as it is crowding another tree. When is the best time to do this and will it harm the tree?
2 Oct, 2010
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If it needs to be done, then after the leaves have fallen is the time to do it. If it's more than a third of the tre, then it might be better to do it in stages, to avoid too much of a shock to the tree. Do it over two years, cutting back to a convenient side growth the first year (which should take the bulk of the branch away from its neighbour, then removing the branch at base the next. Phil J
2 Oct, 2010