How about one of these. Can't remember the name. Tolerates poor dry soil and really easy to prune flat against the fence and to size if you want to. Admittedly, left to its own devices it would get well over 50 cm.
Nandina would certainly suit those conditions. I would favour Gulf Stream over some of the more garish ones like Fire Power. My GS is about 50cm tall and wide. Slow growing so better to invest in a larger specimen.
Abelia Grandiflora is a lovely, graceful flowering shrub that will cope with dry, poor conditions once established. It’s evergreen down to -8 here but can lose it’s leaves in a very hard and dry winter. Takes any amount of pruning to keep to the size and shape you want without complaint, but there are more compact ones.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
Nandina does well for me too and is a feature of municipal plantings here as it does well with ne extra watering if planted well. If you put one in now you'll need to water it all summer while it gets established but that's all.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
I would suggest an ‘evergreen’ agapanthus they love hot sunny sites, even stony ground near a wall. You can get various sizes and coloured blooms. They retain strappy leaves in winter, useful for camouflaging the 2’ wall behind mine. Even with the awful very wet and freezing weather this year it survived and is flourishing and should flower in July
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Abelia Grandiflora is a lovely, graceful flowering shrub that will cope with dry, poor conditions once established. It’s evergreen down to -8 here but can lose it’s leaves in a very hard and dry winter. Takes any amount of pruning to keep to the size and shape you want without complaint, but there are more compact ones.