Posted: 20/03/2016 at 16:49
Sorry about the new name Philippa Its wood not metal.
Ferns grow in cracks in walls - no soil, dry - sounds ok. On the same vein - would that flowery trailey thing work (aubretia?), guess not or someone would have mentioned it.
Crocus or hyacinth bulbs next year?
Plastic plants would work a treat