If you aren't in a consistently wet enough area, it will always be difficult to plant under conifers. Rain doesn't get through the canopy as @Obelixx is describing, and a pleached tree doesn't have the all round canopy that most conifers will have either, so it's far more likely to be dry shade, and you'll have to choose carefully. I grow various things under the conifer and pine I have in a corner, [London Pride, geraniums etc] but I have enough regular rain, and we also have lots of cloud, so ground doesn't dry out so readily, even in summer. You have to work with your conditions, regardless of what you want to do.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Large trees take all of the water and nutrients out of the soil so it is rarely possible to grow any plants under them to thrive. Even dry condition plants get thin and straggly. Plants in containers or tables and chairs are a good solution.
I would say, see how things are when the space is opened and see what you have - what the soil is like, how rooty the ground is, how far out you would need to come out before planting is viable.
Not the most exciting plant but Euphorbia amygdaloides var. robbiae will grow in shady, dry, shallow soil. It will need watering until it gets established but will then spread to give good ground cover. Or, you could get some large pots and plant them up with small shrubs, perennials or annuals that suit the aspect of your bed.
Vinca minor might work if you want low-level evergreen ground cover. It's often said to be invasive (which it can be) but that means it can cope with tough conditions that more delicate things might not be able to cope with.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
@Obelixx. no problem, I’ll take a photo of our big conifer tree. I don’t want it down as it’s full of nests in the Spring, but taking of the bottom branches may improve its looks.
Gardening on the wild, windy west side of Dartmoor.
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I grow various things under the conifer and pine I have in a corner, [London Pride, geraniums etc] but I have enough regular rain, and we also have lots of cloud, so ground doesn't dry out so readily, even in summer.
You have to work with your conditions, regardless of what you want to do.
I live in west central Scotland - not where that photo is...
Plants in containers or tables and chairs are a good solution.