What to put in this tricky location outside shed

Hi everyone, we've just got our new garden shed set up. As you can see there's around a foot's gap (circled out in red in the photo) between the shed and the edge of the raised platform (we are on a sloped site, and there was originally a concrete platform for an old garage). We will be adding another window on the side of the shed to look down to the garden.
We are wondering what we can put there, mainly to stop kids (if any in future) venturing there and falling off. Some pots and planters maybe? But will they block out air circulation around the shed and cause issues? That area is facing southwest so gets full sun. Any ideas and comments are much welcomed!

We are wondering what we can put there, mainly to stop kids (if any in future) venturing there and falling off. Some pots and planters maybe? But will they block out air circulation around the shed and cause issues? That area is facing southwest so gets full sun. Any ideas and comments are much welcomed!


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This side of the raised platform is our garden, and we plan to use the area in front of it as a veg/fruit patch as it gets the best sunshine. Will grow runner beans, raspberries etc there. Maybe they can act as a hedge as well.
Otherwise I love the trellis idea, though how do you erect posts on concrete ground...?
The cladding of the shed is all pressure treated, so hopefully will not need much maintenance. We are also trying to think about a way to grow some climbers (e.g. roses, clematis) on that wall if possible.
Thanks again!