Designing a Circular Bed Around a Japanese Maple (Zone 5)

For a 10-ft circular bed with a central Japanese maple (full sun now, future shade), plant shade-tolerant perennials that handle sun now: Alchemilla mollis (lady's mantle), Heuchera 'Firefly', Polemonium caeruleum (Jacob's ladder), Fragaria vesca 'Reugen' (woodland strawberry), Japanese painted fern. All transition from sun to shade gracefully.