"Martin Brown" wrote in message

The ants are trying to do you a favour. They grow big, ugly and
seedlings will be everywhere within a couple of years. Rip the thing out
while you still can and plant a nice tree from the Acer family rather
than a horrid weed.


Wise advice. Anyone who has to live near a mature sycamore will agree.
Sycamore are forest trees, quite unsuitable for gardens.
Planting one in your own garden is asking for several sorts of trouble.