100 CANTERBURY BELLS - CROWN MIX Campanula Medium Flower Seeds *Comb S/H BLOOM TIME: May - July HARDINESS ZONE: 4 - 10 PLANT HEIGHT: 24 - 36" . . . PLANT SPACING: 9 - 12" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Average COLOR: White, Pink, Light Pink, Light Blue, & Dark Blue Flowers. Canterbury Bells are one of my favorite Campanulas. They come in a wide range of beautiful colors with 2 wide single blooms. They will attract birds, bees, & butterflies.