With their fernlike foliage and lovely, lacy spires of blossoms in shades of white, pink, red, and purple, shade-loving astilbes make the perfect foil for additional beds filled with hosta. In fact, astilbe — sometimes called false spirea — and hosta are two of the very best shade-garden companions. They look absolutely wonderful mass-planted together in slightly shady locations, especially with variegated foliage and different hues of flowers.