Definition - What does Pyrethrum mean?
Pyrethrum is an extract that comes from several different types of Chrysanthemum flowers. It is a naturally derived insecticide. The extract is comprised of pyrethrins, which is often listed as the active ingredient on several different formulations of commercially available pesticides.
When insects make contact with pyrethrum, it shuts down their nervous system and leads to death in the insect. Pyrethrum is considered an effective alternative to many harsh, man-made chemical pesticides on the market. They are suitable for use on consumable crops, especially cannabis plants.
Hydrolife explains Pyrethrum
As a biological insecticide, pyrethrum products are short-lived in the environment. As such, they are an approved product for organic production as long as they do not contain any other ingredients that are not also approved for organics. Because they do not persist on plants for long, they are often safely used up until the day of harvest.
As marijuana is not a crop that can be certified as organic, there is no requirement for the use of pyrethrum. However, many growers who wish to keep their product free from harsh chemicals will use pyrethrum to control several different types of insect pests that may appear in the grow room.
Pyrethrum joins a growing list of organic pesticides being used in cannabis grow rooms. Other options growers use are neem oil, insecticidal soaps, integrated pest management, and certain strains of beneficial bacteria.
Synthetic pyrethrins are known as pyrethroids. These man-made versions persist much longer on the plants and therefore pests are more likely to come in to contact with it over time compared to the naturally occurring pyrethrum. Pyrethroids are not allowed for organic production and as such many cannabis growers avoid its use.