what about a climbing rose .you could dig quite big holes and put some decent top soil in to give them a good start . im no expert and im sure people with greater knowladge will answer this better perhaps .they grow rapidley even up into the tree and you can train them (carefull of the thawns} along the top of fenceces ets.mine grows up into my cherry a good 25 feet so far .the flowers thow not as big as normal roses smell nice and atract nice insect life. very hardy and with ample thawns to diswade the wrong visitors .mines at the end of my dog run and gets the run of from using bleech etc on the said dog run .they have even atempted to dig it up with know effect on the plant.mines white but i bet you could get a few nice colours and looks quite stunning when in full bloom. take care i hope ive helped bye for now .

you can buy hawthorn very cheaply and its quite fast growing-- and good for wildlife too, you could mix blackthirn and rosa rugosa in too for interest, if you click on the garden centre button above and type hawthorn ( crataegus monogyna) into the search box you'll find a supplier

sounds good i will hijack your answer to pamg if you dont mind.

Another cheap and quick grower is Berberis darwinii. and for a useful one why not try gooseberry or Worcesterberry. No one ever comes through a hedge of those and you get edible fruit too! (Not the Berberis berries, they are not).

what about blackberries or are they to invasive ?

They can be especially if as said one side is not accessible. They send out long branches which root as they go and very soon take over any land along side unless weeded out.

While blackberries are invasive, they need to be managed. Espaliering will do the trick. Space the plants out with posts and wires to train them along. And trim them back every year. Cut the vines, but don't remove them until new growth starts, that way they continue to deter pests. They root only if allowed to touch the ground. I've seen a new barbed wire that is coated in plastic that will give instant results.

This may sound daft but why not a serious fence?

i guess fences are easily climbable unlike something with pointy bits on moon grower

How about Pyracantha,they will not be able to climb over that once
established. When you prune this shrub you need the thickest pair of gloves
you can obtain, the thorns are really sharp. you get masses of small flowers
in Spring, and from Autumn to middle of Spring, you get a colourful display
of berries. Lastly it is a quick grower. I wish you luck with your final
choice anyway!

pyracantha & berberis could look good too I once had to take cutting from berberis and spent the next few weeks digging out the thorns-- they seem finer than some of the other plants--but no less deadly!-- how about this mixed hedge-- with all these plants it could be quite a feature :-)

you beat me to it pam lol.

great minds think alike Np :0))))

i guess so lol