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Rubble gardens and fertility

I've got loads of chalk rock, and was wondering if I could do something like add bark, coir, sand, other minerals to make a bed that would hold a little more moisture.
I've seen rock gardens and rock used as mulch. But I'm always puzzled as I am with urban planting as to how trees buried in pavements and roads can get any nutrition.
Is the air and rainfall enough? Is an enriched soil everything? Do people pull back rock mulches and add organic matter? Or feed?
Here is a tour of rubble gardens:
https://www.rhs.org.uk/education-learning/pdf/bursaries/Bursary-Reports/rhs-bursary-report-sally-bower.pdf
I've seen rock gardens and rock used as mulch. But I'm always puzzled as I am with urban planting as to how trees buried in pavements and roads can get any nutrition.
Is the air and rainfall enough? Is an enriched soil everything? Do people pull back rock mulches and add organic matter? Or feed?
Here is a tour of rubble gardens:
https://www.rhs.org.uk/education-learning/pdf/bursaries/Bursary-Reports/rhs-bursary-report-sally-bower.pdf
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I remember reading that figs fruit better if you treat the root stock meanly.