Hi. I've been growing hardy citrus trees for years. I have 2 big ones in front of my 2 front windows as a security measure. They're about 6' tall. I have a bunch of babies growing in pots as well. They're a great hedge tree for sure. Very pretty and unusual trees. Osage orange trees are great also. I have a couple babies growing in pots. If you're looking for hedge trees for use as a deterrent i do have other suggestions for you. Honey locust trees are full of thorns and have edible uses. Also black locust. ..it has edible flowers. And something that won't get as big as the trees but is a great deterrent is prickly pears. Lot's of eddible uses. And so easy to make new plants. Just break off a pad and stick it in the ground. ..