You can grow evergreen ferns in shade in pots. Harts’ Tongue Fern (any fern starting with ‘Asplenium’) is evergreen. Sarcoccoa evergreen scented flowers jan/feb. Fibrious begonia or bizzy lizzies for summer colour. Some clematis will work but you need a fair size pot. Ivy to trail over the edge. Fatsia but won't be a long term plant for a pot. It is an open porch?
Also have a look at hellebores and skimmia. For ferns, Polystichum polyblepharum is evergreen and easy to maintain — just needs all the old leaves cutting off each spring and the new ones quickly grow out
I have a similar shady front 'garden' and have bought ready to plant up in containers: Polystichum setiferum ‘Herrenhausen’; Asplenium scolopendrium;
Sarcococca hookeriana ‘Purple Stem’; and Vinca minor ‘Argenteovariegata’ (plus another vinca minor but can't remember what). All are evergreen. I'll be adding some other flowering plants for all year round colour; ideally snowdrops for winter and not sure yet about summer.
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Sarcoccoa evergreen scented flowers jan/feb.
Fibrious begonia or bizzy lizzies for summer colour.
Some clematis will work but you need a fair size pot.
Ivy to trail over the edge.
Fatsia but won't be a long term plant for a pot.
It is an open porch?
Sarcococca hookeriana ‘Purple Stem’; and Vinca minor ‘Argenteovariegata’ (plus another vinca minor but can't remember what). All are evergreen. I'll be adding some other flowering plants for all year round colour; ideally snowdrops for winter and not sure yet about summer.