this is my neighbors tree, and I am curious to find out which species it is?
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Extremely unusual - it will put out flowers from all over the wood, even ancient wood on bare branches. When it flowers (which is not every year in all of the UK), it makes an absolutely fantastic sight.
If you are lucky it can set huge quantities of seed from self pollination - very easy to germinate if stratified.
One of my favourite garden trees - it is small- and slow-growing. This one looks "huge" and probably ancient, unless it is not siliquastrum.
Lat/Lng: 51.415238660055, 0.017242580652237
OS grid ref: TQ403703
Likely to be on my backyard