Acorus is a grass-like evergreen perennial with delicate, slightly curved foliage that ranges in colour from light to golden yellow and is striped yellow and green.
It is a versatile plant with fleshy roots (rhizomes) and is equally happy growing in a pond, in a damp area or in a garden bed.
The tussocks, or clumps, grow to about 30cm x 30cm and quickly form a dense ground cover. The striking golden-yellow foliage makes it a useful plant to brighten up an area that is predominantly green.