"David Hill" wrote in message ...
If you are going to use Gorse them make sure you get the double form as it
doesn't set seed otherwise you will have seedlings everywhere,

Himalayan Giant blackberries are the thing to send vandals running
home to Mummy if they ever get disentangled: delightfully vicious! But
they too will seed, and you won't have a lot of fun pruning them,
though you'll have the bonus of fruit. Best grown on a wire fence to
keep them in order.

There's a hideous holly called Hedgehog, or Ferox, which has spines in
the middle of the leaves not just round the edges. Not a good looker,
but quite a barrier. I suppose it has berries, but can't remember if
it's male or female or both. (No: just looked it up, and it's
all-male; but there are silver and gold variegated forms, which would
look nice.)

There's a particularly menacing hawthorn, too: I can't remember what
it's called, but David probably can.

Blackthorns are suitably spiny, and provide a brief froth of blossom
in early spring, and sloes in autumn. They tend to have unaccountably
dead branches, though. Great walking-stick material.

Mike.