United Kingdom 
what are the risks of the roots of the roninia tree spreading
On plant
Robinia
21 Sep, 2010
Answers
Very much so!.... will spread far in excess of the crown going be my own experience with this tree in the past, especially when happy on very sandy soil
21 Sep, 2010
Related photos
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Chrispook
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Janey
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Chrispook
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Chrispook
Related products
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Robinia Pseudoacacia 'Frisia'
£40.00 at Burncoose -
Robinia Pseudoacacia Frisia
£38.95 at Blooming Direct -
Robinia Hispida 'Rosea'
£25.00 at Burncoose
I imagine you mean Robinia pseudacacia - the roots will spread certainly as much as the crown size of the tree.
21 Sep, 2010