Plant WitchPlants: C
- Crown of Thorns Euphorbia milii Flowering shrub
- Crucifix Orchid Epidendrum radicans Wildflower
- Cucumber Cucumis sativus Fruiting
- Culver's Root Veronicastrum virginicum Wildflower
- Cumberland Azalea Rhododendron cumberlandense Flowering shrub
- Cumin Cuminum cyminum Herb
- Cup and Saucer Vine Cobaea scandens Vine
- Cup of Gold Vine Solandra maxima Vine
- Cup Plant Silphium perfoliatum Wildflower
- Cupflower Nierembergia scoparia Garden perennial
- Cupid's Dart Catananche caerulea Garden perennial
- Curlycup Gumweed Grindelia squarrosa Wildflower
- Cushion Buckwheat Eriogonum ovalifolium Creeping perennial
- Cushion Spurge Euphorbia epithymoides Garden perennial
- Cutleaf Balsamroot Balsamorhiza macrophylla Wildflower
- Cutleaf Coneflower Rudbeckia laciniata Wildflower
- Cutleaf Stephanandra Stephanandra incisa Creeping perennial
- Cyclamineus Daffodil Narcissus cyclamineus Bulb
- Cylindrical Blazing Star Liatris cylindracea
- Cypress Vine Ipomoea quamoclit Garden annual