'Crushed Ice' Grassy Arrowhead Cryptotaenia 'Atropurpurea'
'Crystal Blue' Tall Bearded German Iris 'Crystal Confetti' Lawn Marsh Pennywort
'Crystal Orange' Creeping Zinnia: angustifolia 'Crystal White' Creeping Zinnia: angustifolia
'Crystal Yellow' Creeping Zinnia: angustifolia Cuban Lily
Cuban Oregano (spp.) Cucumber, Bitter 'Spindle'
Cucumber, Exploding Cucumber, Squirting
Cudweed 'Fairy Gold' Cudweed (spp.)
Culver's Root (spp.) Culver's Root White
Culver's Root, Siberian 'Cunningham' Moss Phlox
Cup and Saucer (spp.) Cup and Saucer Vine (spp.)
Cup and Saucer 'Champion Blue' Cup Fern: punctilobula
Cup Flower, White Cup Plant
Cupflower (spp.) Cupflower 'Mont Blanc'
Cuphea 'David Verity' Cuphea 'Twinkle Pink'
Cuphea, Red Cupid's Bower
'Cupid's Dart' Blue Cupidone Cupid's Dart (spp.)
Cupid's Dart 'Cupid's Dart' Curiosity Plant (spp.)
Curiosity Plant 'Monstrosus' Curly Leaf Tansy (spp.)
Curly Leaf Tansy 'Crispum' Curry Plant (spp.)
Curry Plant: italicum serotinum Curve Leaf Yucca
Cushion Spurge Cusick Quamash
Cut Leaf Water Clover Cut Mum (spp.)
Cut Mum 'Alisha' Cut Mum 'Ashley'
Cut Mum 'Barbie' Cut Mum 'Bethany'
Cut Mum 'Bonnie' Cut Mum 'Bright Gretchan'
Cut Mum 'Cool Cheryl' Cut Mum 'Darlene'
Cut Mum 'Diana' Cut Mum 'Durango'
Cut Mum 'Fiona' Cut Mum 'Flashy Gretchen'
Cut Mum 'Frosty Jeanette' Cut Mum 'Hankie'
Cut Mum 'Harvard' Cut Mum 'Hillside Pink Sheffield'
Cut Mum 'Hope' Cut Mum 'Irvine Currant'
Cut Mum 'Irvine Dark Bronze' Cut Mum 'Irvine Pink'
Cut Mum 'Irvine Red' Cut Mum 'Irvine Regal'
Cut Mum 'Irvine Yellow' Cut Mum 'Jacqueline'
Cut Mum 'Jillian' Cut Mum 'Jolly Cheryl'
Cut Mum 'Mary' Cut Mum 'Mia'
Cut Mum 'Minnautumn' Cut Mum 'Miranda'
Cut Mum 'Phyllis' Cut Mum 'Plus'
Cut Mum 'Priscilla' Cut Mum 'Richmond'
Cut Mum 'Rivendell' Cut Mum 'Rock'
Cut Mum 'Sheffield' Cut Mum 'Sly-Jenna'
Cut Mum 'Sparkling Cheryl' Cut Mum 'Spirit Lake'
Cut Mum 'Swing' Cut Mum 'Theresa'
Cut Mum 'White Needle' Cut Mum 'Wilma'
Cut Mum 'Yellow Sharp' Cut-leaf Anemone 'Rubra'
Cutleaf Coneflower (spp.) Cutleaf Coneflower 'Goldquelle'
Cutleaf Daisy 'Cutleaf' Japanese Pachysandra
Cut-leaved Mallow (spp.) Cut-leaved Mallow 'Fastigiata'
Cutpetal Bush Monkey Flower Cyanastrum
Cyclamen, Florist's Cyclamen, Greenhouse