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Confused about shade

i have a north facing garden. I have a border which is in shade and doesn’t receive direct sunlight due to a retaining wall. When the sun is behind the clouds it isn’t any darker than the rest of the garden as it’s very open to the sky and gets lots of indirect light. I’m trying to figure out appropriate plants I looked at RHS website which says Light Shade is “ A site that is open to the sky, but screened from direct sunlight by an obstacle, such as a high wall or group of trees” but also in a separate part of same article says “in practical terms if a site receives less than two hours of direct sun per day, it must be considered to be heavy shade” lol so am I dealing with light or heavy shade? Also online nurseries tend to categorise into “shade” or “part shade”. Which should I pick? Confused.
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In my last garden -central Belgium - our garden was mostly on the north side of the house so plants nearest the house only had direct sun very early and very late between the spring and autumn equinoxes. The bed nearest the house was also the dampest so very good for astilbes, astilboides, candelabra primula, hostas, ligularia, lily of the valley, Japanese anemones, ferns, dicentra......... Another, drier bed had a Falstaff rose, clematis caerulea luxurians and more hostas and an arch leading to my work area had clematis Nelly Moser and Rahvarinne.
This garden is much hotter but I have a long, north facing wall thatgets sun till 11ish and again after 5pm and that is planted witha Kiftsgate rose offspring, clematis Jackmanii, sangisorbas, pulmonaira, Japanese fern, thalictrum, physostegia, hardy geraniums, ammi major, hemerocallis, hydrangea paniculata and tw enormous mop head hydrangea we inherited. I have just cleared a space between them to plant a group of 3 Japanese maples which I shall underplant with bergenia and narcissus.
If your soil isn't alkaline, Azaleas, Pieris and Skimmias will also thrive.
I live in west central Scotland - not where that photo is...
I live in west central Scotland - not where that photo is...