One of the best shade perennials - pairs well with Hosta - try Allium. Various sizes (these ones are GIANTS). Of the onion family - bulbs. Slow multiplier, but oh so dramatic! Blooms spring/summer then dies back. Beauty wants these/ like dr Seuss plants!
Hostas are a topnotch groundcover for shady areas. Plant them on a tough-to-mow hillside to create a lovely, carefree garden bed. If you have a steep slope that water runs down so quickly the soil can't absorb moisture, try breaking up the hill with rock