By Panddjames
Somerset,
United Kingdom 
We have had this pretty Robinia in a pot for about 15 years. The trunk (can just be seen top centre of pic 1)has been cut down to encourage the lower growth. It has now sent out this tall shoot from the base of the trunk (can be seen top left of pic 1 and more of it in pic 2) which has large thorns. As the old plant never had thorns am wondering what has happened. Any ideas?
On plant
Robinia
5 Aug, 2013
Answers
Thank you, that reason would never have occurred to me, very grateful to have it so clearly explained. I knew it to be in the Robinia family but have long forgotten which one and was unsure if anyone would be able to help, fortunately the photos must have helped.
15 Aug, 2013
Well the photo did and didn't help - most Robinias are grafted, particularly the smaller cultivars, so your description was really enough to work out what will have happened. Very well described.
15 Aug, 2013
Related photos
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Chrispook
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Janey
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Chrispook
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Chrispook
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This will be a sucker off the rootstock - if you get no further growth from the stump where you've cut it back, I'd say the grafted, original tree has died and you're now left with just a live rootstock, which will only produce thorny growth.
5 Aug, 2013