Mondo grass (where did that name come from?) is not in fact a true grass, but an evergreen clump-forming perennial that looks like one. Handsome virtually black leaves are complemented in summer by tiny purplish white flowers, followed by black berries. Adorable and seemingly indestructible. Any reasonable soil. Sun or semi-shade. 10 in. 1 litre pot.
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We have this in the ground and in large pots and it does equally well in both situations. It's certainly not a slow grower, as some would suggest, and quickly fills out.
Ophiopogon Nigrescens is a hardy evergreen perennial plant with grassy black leaves and purplish white flowers in summer suitable for sun or semi-shade.