BACK TO BLACK
If left unchecked, the garden will quite happily revert back to nature. One problem is bramble, and every so often it has to be cut back. I wait for some fruit before it has to go.
Not many blackcurrants this year? It may be down to moving the plant last year, or not pruning?
Ajuga reptans. Use this plant for ground cover in a semi-shaded area.
Scabious (Chilli Black). Flowers on with regular deadheading. Plants easily take from cuttings.
Ophiopogon (Black Grass). A great plant to use in a black planting scheme.