Classification 
The grouping together, through the use of a ranking system, of organisms that share similar characteristics. For examples, grasses all share similar features and are therefore all grouped together under the grass family.
Clean Label
A name for a product which has an organic chemical composition and not with synthetic man-made chemicals present, which is typical of the majority of pesticides available to the amateur and professional markets. These types of products might be used for the weed control around plants in borders and bedding or for the complete renovation of a lawn that is in a poor condition with a lot of moss, thatch and weeds, or a sports turf area that needs the surface sward removing and replacing with new grass species and cultivars. One example of this type of product might be acetic acid, but not glyphos
Continue reading about this
Clippings
Detached grass leaves, and other vegetative material, which result from the action of mowing a turfgrass surface. This is also termed Arisings or Cuttings.
Coefficient of Variation
A measure of the consistency of data, identifying the extent of variation that exists between the data, with a high coefficient of variation (CV) meaning that there is a large variability and less uniformity amongst the data.
It is the ratio of the standard deviation (SD) to the mean and is often expressed as a percentage: CV = (SD ÷ Mean) x 100 (this approach is also called the relative standard deviation). Alternatively, it may be used to express the numeric variation between data: CV = SD ÷ Mean.
This measure might be used to compare, and contrast assessments made on turfgrass surfac
Continue reading about this
Cohesion
The force of attraction between two molecules of the same substance. In the transpiration stream process this is a feature of water molecules interacting with each other and effectively pulling the lower molecule up the xylem vessel, resulting in a continuous stream of connected water molecules.
Cold Hardiness
The ability of a plant to resist damage to itself, by being able to survive and adequately recover, when exposed to temperatures less than freezing, i.e. 0°C.
Collenchyma
One of the three main ground tissues (the others being Parenchyma and Sclerenchyma). These cells are elongated, with thickened cell corners, and provide structural, yet flexible, support for plants.
Colourant
A dye which is mixed with water and sprayed on a turf surface. This might be to aid pesticide or fertiliser application, or as a green dye to add colour to an otherwise unhealthy looking or stressed turf surface to enhance its appearance for a key event where additional maintenance, renovation or repair work would not otherwise produce a suitable looking surface in time.
Comb
An item of equipment which is typically fitted to the front of a cylinder mower, being located just behind the front roller and in front of the mowing cylinder.
Common Name
A general, non-scientific, name for a plant, animal or other organism. For preciseness and the avoidance of doubt when talking about organisms, especially in formal discussions, it is advisable to use the scientific name. When general discussion or comment is being made and where common names are fairly universal, which is typical of those in turf culture, then it's usual to refer to an organism by its common name. Clarification should still be sought where there is possible confusion, for example, Ryegrass could mean either the common perennial ryegrass, or the annual Italian ryegrass, a
Continue reading about this