Is there anything i can do to stop them re-growing/spruting or is that
it?

A lot depends on the species of the trees. Aspens, for instance, are
notorious senders-upof new shoots. The easiest thing to do, imho,
is to start a year or two before... ring the bark on the tree down through
the cambium. The tree then uses the stored reserves in the roots to send
out this year's nee crop of leaves, and this year's photosynthate doesn't
get transferred to the roots. After a couple of years of all give and no
take to the root system, you can generally take the tree down with minimal
chances of resprouting.

In your case, however, I'd suggest just a weekly walk around with a sharp
hoe, looking for evidence of regrowth.

Kay