Shallow flower bed

[Colette]

I have a small back garden - 2/3 covered in ugly slabs (future project costing too much £ at the moment ). Running down side of the garage is a flower bed that I have haphazardly filled with cuttings, seeds and spring bulbs.TBH it is a mess except for some pink mallow and perenial sweetpeas that I have pared right back. .

I decided to dig it up (except for mallow , sweetpeas and a few lupins) and add potting compost .after a lot of digging I have found it is really shallow eg. less than a foot to brickwork base. So I'm not sure if I should treat it like a big pot ? I'm amateur , lived in a flat previously and don't have loads of time but really enjoy looking out at some colour .
It is in sun part of the day and taller plants tend to lean away from the garage. We are in Scotland as well !
I can try and add a picture if that would help. Would love advice on soil, what plants to put in .
thanks

Please see photo of dry unloved flowerbed with attractive slug trails

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As it's the garage and not the house ( I'm assuming it's detached from the house ) you could treat it like a raised bed and put a stone, brick or sleeper surround and infill with compost.

Obvious not a good idea if it's part of the house with a damp course. Other than that, low growing ground covering plants. If you put in some eracacious compost you could plant heathers.

Thanks JY05.yes it is freestanding. hasn't thought of building up the sides, like that idea.
Think I will put some ground covering plants initially. Front garden soil is acidic I think, could mix some of that in with compost ? Thanks for the ideas

Don't build it up beyond the DPC line though otherwise you could have problems.

Posted but it seems to have vanished! Here goes again.

As its not part of the house you could put a moisture barrier (plastic) at the back so the garage wall does not get wet.

I would not use front garden soil, as you are in danger of transferring weeds. Garden centres have bags of soil improver and eracacious compost at about £6 for 40 litres.

Thanks for advice re transferring buddleia- and plant suggestions, have enough battles in front garden with them already. interesting re.buddleia- dug full size buddleia out as was taking over, I didn't know you could get dwarf ones.

Sorry meant 'transferring soil'

Thanks , they would look good with the geraniums too .quite excited now !