Fleshy plant, almost always originated in the Americas, common in deserts (although not restricted to them) and, with very few exceptions, whose leaves have been replaced with spines which emerge from areoles.
Calla lily
Flower originally from South Africa. Also called arum lily (Zantedeschia aethiopica).
Calyx
Cup-like structure, consisting of separate or fused sepals, usually green (but sometimes the same color as the petals) that surrounds the inferior part of the corolla.
Cane
Long, woody but flexible branch, generally with well pronounced nodes.
Capillary Action
Water absorption by a filament or hair, also known as capillary motion, or capillarity. This term is used to describe how a soil mix absorbs water when a pot is placed in direct contact with a saucer of water.
Capitula
Type of inflorescence with a broad and short axis, flowers are almost all on the same plane. An inflorescence characteristic of the Composites or Asters, like the daisy and sunflower.
Carnation
In Italy, means contemplation.
Casablanca Lily
Has a pleasant sweet aroma.
Celosia
Also known as woolflowers or cockscombs.
Cherry
Cherry blossom.
Chlorophyll
Green pigment found in the stems and leaves of plants
Chrysanthemum
Also known as mums.
Clay
Kind of soil composed essentially of aluminum silicates, tends to retain water.
Climbing plant
Plant that tends to grow in the opposite direction as gravity, through lacing tendrils, twisting the stem, adhesion or growing roots inside a support structure, among other means.
Clove
Aerial or subterranean bud that grows near the axils of leaves, fruits or near rhizomes, roots and bulbs, and that can develop into an adult plant.
Clump
Mix of soil interwoven with roots that can be seen when the plant is withdrawn from a vase. The examination of the clump allows to check if the plant needs to be re-potted.
Cluster
Group of flowers or fruits united by pedicles to a common axis; synonymous with raceme (Also see inflorescence)
Compost
Organic matter resulting from decomposition of plant remains, sometimes mixed with other substances of animal or plant origin, including manure, leftover food, rags and old paper. Generally, anything that was ever alive can be a part of Compost, but in certain cases it’s preferable to use exclusively plant compost.
Compound
A leaf blade subdivided into segments (leaflets)
Compound leaf
Leaf divided in two or more segments. E.g., papyrus. (Also see pinnate, palmate).
Cordate
Heart-shaped (leaf).
Corm
Subterranean organ for storage, with a thick stalk covered by a thin paper-textured layer. At the top of the corm, a bud produces roots and shoots; type of subterranean stem similar to a bulb but without fleshy scales. E.g., Gladioli
Corn Flower
Corolla
The whorl of flower petals. The corolla can be made of separate or fused petals (Also see Flower, Petal).
Crown
Aboveground or aerial part of a plant, including stems, leaves and reproductive structures; part of the plant with the apical meristems that guides it and stimulates its growth. Example: African violets. The crown can also be the basal part of the plant where the roots and stem meet (also see Base)
Culm
Stem with well demarcated knots, like that of bamboo or other grasses.
Cultivar
Plant developed by cultivation and baptized by the gardener. The names of cultivars appear within quotes, to distinguish them from scientific names. (Also see Variety)
Cutting
Part of a plant destined for vegetative propagation and that, after gaining roots, becomes a plant. A cutting is not necessarily a stem or stalk, it can be a leaf, root, etc.