I have some steps made from untreated wood with gaps in the middle so that I can plant in between. The steps are in part shade and the only thing I can think of is soleirolia (mind your own business) does anyone have any other suggestions?
There are dozens of plants that have some tolerance to being walked on. Have a look at agroforestry sites for under-storey planting (most have a commentary about whether they will tolerate being stepped on) or there are specialist sites which list and sell plants for different habitats, including shade. I've referred to 'stepables' a few times, which is a US site but has plenty of ideas for plants that you can get and will grow well in the UK
Gardening on the edge of Exmoor, in Devon
“It's still magic even if you know how it's done.”
Low growing, creeping thymes are good if it's a sunny aspect and the soil is well drained.
Edited to add: Sorry - just seen that you said it is partly shaded. Thymes might still work if they get some sun and you can give them really sharp drainage. I have thyme growing in an area where they are in the shade from about 3pm onwards.
Heaven is ... sitting in the garden with a G&T and a cat while watching the sun go down
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“It's still magic even if you know how it's done.”
Edited to add: Sorry - just seen that you said it is partly shaded. Thymes might still work if they get some sun and you can give them really sharp drainage. I have thyme growing in an area where they are in the shade from about 3pm onwards.