why has this tree different coloured leaves?

Sorry Noel not from that pix. need to see the leaves etc. But I do suspect it is two trees growing very closely together, hence the different coloured leaves.

The tree is possibly an Acer and it has been propagated by grafting. The nurseryman took an easy and cheap to grow seedling tree as a rootstock, cut off the top and grafted a fancier variety onto the stem. Since then a new shoot has develpoed from the original rootstock and has been allowed to grow to tree size.
I would suggest that the rootstock is the green tree and the garft the red one.

Hi Moon Grower,

I have many photos of buds, flowers etc.
I sent a pic of the leaves as I could only send one photo, then updated my query to send the root pic. That action seems to have cancelled my first pic (I'm a newbie to this forum). I will update again with the leaves pic.

On close inspection it appears to be a single trunk, the barks and blemishes are the same. I also have pics of buds, flowers and close-ups of the leaves.

How can I send you more than one pic (except to keep updating)?

Thanks Noel

I would like to know how to do that too! Newbies eh.

I agree with bulbaholic,I have had the same problem with Cytisus Battandeiri,it is suckering all over the place

I think bulbaholics answer is the right one. I have a crab apple root-stock flowering on my cooking apple tree. its a pretty combination though Tonmai no matter what the cause.

Noel you can only post 1 pix in a question but lots in a blog

its a nice accident though bulb.i fear the green will take over as it ages but it looks smart now

I have put more pics on a blog called "unidentified tree...".

Thanks, Tonmai

your welcome