Osmunda regalis A majestic fern with widely spaced leaflets on the fronds giving them the appearance of locust leaves. Grows 2 to 5 feet tall and spreads to 2 feet. Fronds unfold red, mature a deep sea green, & turn golden yellow in fall. Best in partial shade in moist, organically rich soil. Sun tolerant on sites that are constantly moist. Nice at water's edge where it will grow taller. Royal Fern