• Butterfly Blue Pincushion Flower
• Caesar's Brother Siberian Iris
• Candy Stripe Creeping Phlox
• Cape Rush

• Caradonna Meadow Sage
• Carex buchananii
• Carex flagellifera 'Toffee Twist'
• Caroline Coral Bells

• Cascade Spice Japanese Iris
• Cassa Blue Flax Lily
• Catlin's Giant Carpet Bugle
• Ceratostigma plumbaginoides 'Leadwort'

• Chicago Apache Daylily
• Chilled Wine Siberian Iris
• Chocolate Chip Carpet Bugle
• Chrysocephalum 'Flambe Yellow'

• Coreopsis 'Tequila Sunrise'
• Coreopsis grandiflora 'Early Sunrise'
• Cotton Tail Thrift
• Crater Lake Blue Speedwell

• Cream Delight New Zealand Flax
• Creme Brulee? Tickseed
• Crimson Curls Coral Bells
• Cuphea llavea 'Totally Tempted'