Both sides, would be my guess.

Yes, both sides. Are the berries unsafe to eat though? I'd not heard that. tghey're related to grapes.

+oM

I've seen info on the berries range from mildly to highly toxic for humans. I'd assume the worse case... especially for children. Not so important to eliminate the berries, but good to be aware that they are poisonous should some person or pet happen to get into them.

We've had VC covering a 3 ft deep bed and up the 50 ft wide brick veneer wall on the north side of the house where we have to trim it aggressively to keep it from reaching the wooden frieze board and soffit. The full shade and/or regular trimmings result in no berries.... or fall color :-( So it's possible to eliminate the berry risk if it's a concern with the right conditions and a bit of regular work.

Here is a link that might be useful: Poisonous Plants of NC: Parthenocissus quinquefolia

There is no question it will grow through to both sides. I've been trying to get some ripe berries for years, but they get eaten so,fast by birds and animals that I never find a ripe one. This year I put little drawstring bags over a few branches so I can collect seed to plant along my fence. Are you concerned about people passing by picking the berries and eating them? IMO if someone is old enough to be walking by unsupervised, they should have been taught not to eat strange berries in other people's yards. You shouldn't have to worry about them.

Martha

I totally agree, but that's just not how it is here. Even though our crime rate is above the nat'l average little kids get to roam the neighborhood doing what they want basically.

So I'd be dealing with little kids probably picking these

I've been letting VC run wild on my garage for the past few years and it's almost completely covered at this point. I have a lot of bird traffic in my yard, so the berries don't last too long.