Aaah - that looks a bit different - a much larger area than the first photo implied. No longer convinced about the render route!
I'd be more tempted to go for something along the lines of Ben's or WillDB's suggestions.
Personally I wouldn't put ivy in there as it can go a bit mad and might be difficult to control if access to the back of the border is a bit tricky.
Re willow screening. All the willow screening I've seen looks quite tatty after the first season. I'd go for a chunkier / more permanent / minimal maintenance solution.
Heaven is ... sitting in the garden with a G&T and a cat while watching the sun go down
Certainly I will fill all the holes, and will try to get the face level/smooth. The "corrugated" concrete protrudes a bit, so it would hold off anything solid from being flush up against the wall.
It would look better in brick to match the existing brick wall on the right, and probably easier to build (once you've learnt how to!). You might have to have a vertical step forward to accommodate the existing rough stuff. I would be inclined to go for WillDB's suggestion of horizontal wood slats as easier to construct. We bought the willow screening to hide a concrete block wall quickly which it did and has lasted 4-5 years ago but is now looking tatty. If you're happy with that time scale, that would be the quickest and cheapest option. What you do is obviously down to your DIY skills, budget and whether or not you can get any materials delivered.
Be careful with that one, it's the sort of chore that can easily turn into a big job when you start to pick at it and whatever is above it (pavement?) starts to crumble away. Personally i'd try to stick to a wet trade fix, either cement sand render or, if you can make a little access space in front to erect forms, recast in concrete to reform a wall. I'd try to avoid trying to build things onto it, which as I said, can escalate. But that's just me. Good luck
I wouldn't go for plastic as it will degrade and look ugly without being bio-degradable. Would new treated railway sleepers stood up on their ends and attached to the wall be possible? They would last much longer than willow or plastic and having a rustic look wouldn't need to be laid as precisely as a new wall or wall surface. They will also fade to a silvery grey which will look natural and will hopefully set off your plants well.
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I'd be more tempted to go for something along the lines of Ben's or WillDB's suggestions.
Personally I wouldn't put ivy in there as it can go a bit mad and might be difficult to control if access to the back of the border is a bit tricky.
Re willow screening. All the willow screening I've seen looks quite tatty after the first season. I'd go for a chunkier / more permanent / minimal maintenance solution.
Personally i'd try to stick to a wet trade fix, either cement sand render or, if you can make a little access space in front to erect forms, recast in concrete to reform a wall.
I'd try to avoid trying to build things onto it, which as I said, can escalate.
But that's just me.
Good luck