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Aha! The yellow one is Robinia pseudoacacia 'Frisia'
Robinia (False Acacia)indeed, if the leaves remain yellow all year and it has pea like flowers.
The yellow leaves don't remain all year round, neither does the green ones.
Yes indeed.You are quite right about these Frisia being grown on stock roots. This variety is grafted onto stock root. What you have growing as your 3rd tree are the result of 'suckers', the stock root growing it's own tree top.
What you have growing as your 3rd tree are the result of 'suckers', the stock root growing it's own tree top.
If you did not plant #1 & #2, it is possible that #1 was the same as #2, but suckers growing from the root stock took away the nutrients to the grafted tree, so it did not survive. Suckers should be removed to protect the grafted plant.
There may be other solutions, for example, many trees are grown from different root stock (especially fruit trees), whereby the desired tree is grafted onto the stem of another. Is there a "collar" feature on the #2 tree, at about 50cm or so? This might indicate a graft.
I would suggest cutting the new plants back ground level, unless you want them. At the distance they are from #1 & 2 I don't think they are suckers, more likely saplings from seed.
So wait... what do you think #3 is? Not a new species, we've worked that one out. But do you think it came from the #1 tree?