This unusual fern is a grass-like mound called Tulbaghia 'Silver Lace' and it looks rather like a tiny Agapanthus. It produces delicate rounded flowerheads of lavender mauve flowers in summer above fresh variegated foliage. Sunny very well drained spot.
Please note: this plant is not reliably hardy and might need winter protection. Can be treated as a house plant or brought under cover in winter.