Glossary for Gardeners – V

Glossary for Gardeners

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~ V ~

vacuole
A fluid-filled sac within a cell.
vaporization
The evaporation of the active ingredient in a pesticide during or after application.
variegation
An inherited, irregular pattern of color on a leaf or petal.

variety
A strain of a plant having distinctive features that persist over successive generations in the absence of human intervention. Generally, variety applies to naturally-occuring strains, while cultivar applies to horticulturally-developed strains.
vascular cambium
A narrow cylinder of cells that gives rise to secondary xylem and phloem. A lateral meristem.
vascular plant
A plant which has water and food conducting tissues.
vascular tissue
Water-, nutrient-, and photosynthate-conducting tissue. See xylem, phloem.
vector
A transmitter or carrier of disease.

vegetative propagation
The increase of plants by asexual means using vegetative parts. Normally results in a population of identical individuals. Can occur by either natural means (e.g., bulblets, cormels, offsets, plantlets, or runners), or by artificial means (e.g., cuttings, division, budding, grafting, or layering).
vein
A strand of xylem and phloem in a leaf blade.
venation
The arrangement of veins in a leaf.
vernalization
A low-temperature treatment promoting flowering.
vernation
The arrangement of new leaves within an older leaf sheath (e.g., on a grass plant).
verticle spacing
The vertical space between branches on a tree.
viability
A seed’s ability to germinate.
virus
An infectious agent too small to see with a compound microscope. Multiplies only within a living host cell.