@PinkCherryBlossom Our tree was planted as a small sapling (probably about 2 years old) about 7-8 years ago. Although we have a large-ish garden for London, I think we bought the wrong tree. It is now about 4-5 metres in height, and almost four metres in width. It still has a lot of growing to do.
They become quite large trees, and you need a considerable amount of space for them. They don't like being pruned (ours bled continuously over the Winter, after we pruned lots of the lower branches), so that's not really an option to keep them to a reasonable size. If yours is already 3.5m tall, then you can expect it to reach at least that in width. They put on quite a bit of horizontal growth each year, as well as vertical.
Try to find the biggest space you can for it. Keep it away from your house and other buildings, and as far away from neighbouring fences too. They put on a lovely show of catkins in Spring, but not every year. We have yet to get a mature Walnut from ours, they squirrels always get them first, however last year we picked the young green Walnuts, and have made Chutney, and a liquer called Nocello.
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They become quite large trees, and you need a considerable amount of space for them. They don't like being pruned (ours bled continuously over the Winter, after we pruned lots of the lower branches), so that's not really an option to keep them to a reasonable size. If yours is already 3.5m tall, then you can expect it to reach at least that in width. They put on quite a bit of horizontal growth each year, as well as vertical.
Try to find the biggest space you can for it. Keep it away from your house and other buildings, and as far away from neighbouring fences too. They put on a lovely show of catkins in Spring, but not every year. We have yet to get a mature Walnut from ours, they squirrels always get them first, however last year we picked the young green Walnuts, and have made Chutney, and a liquer called Nocello.