Plant growth regulator (PGR)and growing cannabis

Published May 13, 2019 09:28 a.m. ET
Plant growth regulator, should you use it? Photo Credit Mary Altaffer

Is your bud dense?  Are all your plants the of the same short, stocky variety? Is there no flavor to your bud? If your bud has a lot of orange hairs on it; chances are you have PGR weed. Yes, the bud is big, too bad it doesn't good.

PGR or as some call it “plant growth retardants” are commercially available under different brand names. Some of these chemical’s purposes are to suppress a natural growth hormone and to produce dense buds and increase the resistance to mold.

Different PGR Chemicals

PBZ, this chemical diminishes the plant's ability to produce THC and terpenes. This could explain the “no taste and no high” aspect.

Daminozide aka Alar, this breaks down into a molecule that is a known carcinogen. Banned for use in fruit and vegetable cultivation in 1989.

Chlormequat chloride, is found in flowering mixtures. PGR’s in weed have an impact on mammalian fertility, that means humans to! Watch out for these if your worried about any impact on your chances of having kids one day.

Plants that are treated with Florel or Ethephon are expected to have increased THC levels in the vegetative stage. Florel in cannabis is used to reverse “hermies” or hermaphrodite plants.

PGR in weed makes it less appealing and lack in potency compared to other buds.

It makes sense that we should all learn to know where and what our weed has been growing. PGR’s are bad for us. They are toxic, highly dangerous and cancerous to humans that consume them. PGR’s in weed can produce a scattered even paranoid high, you may also develop a terrible headache.


Take note that PGR’s are not the same as natural plant hormones. PGR’s are synthetic chemicals. These chemicals are designed to change the plant behavior. Many of these chemicals are highly toxic. Most PGR’s have been banned since the 1970's for human consumption. Sad to say they are still being used in the cultivation of cannabis, which leads to our ingestion of poisons. Cannabis is a large cash crop industry — the faster that a plant can be harvested the better. The denseness of the bud and the time of harvesting produces a better profit. If only people could see the damage that these chemical and others like them can cause to our bodies.

Effects of PGR’s on humans

Chronic exposure to pesticide for humans is linked with respiratory diseases, congenital disabilities, diabetes, fertility, and reproductive problems. Cancer in many forms has been related to pesticides.

Hash oil concentrates contain similar chemical properties to pesticides. During the extraction, any residual pesticides on the cannabis are concentrated just the same as the cannabinoid. The effects when smoked are magnified ten times that of the bud or flower due to the process involved.

Here is a what happens when this chemical is usedin the cultivation of your cannabis. Myclobutanilis used in crops like grapes to keep the fungus under control. The problem when used on cannabis plants comes around when it is heated, as in a joint. When heated through smoking, this chemical changes to hydrogen cyanide. This was the poisonous chemical used in Nazi gas chambers.

Do you want to smoke PGR weed? Read your labels, my friend; it may help you to live a healthier life while indulging in the beautiful, healthy cannabis available out there.

Remember to always intake responsibly and most of all, enjoy!



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