Rolling Mountain Kush presents information for educational purposes only. This content is only viewable once you have verified your age.

Age Verification

By clicking 'Yes', I certify that I am over the age of 21 and/or a valid medical card holder.




Grow Tips From Canada's First Cannabis Cultivation PhD

July 25, 2019

  • Dr. Deron Caplan
  • Proven Grow Tips

Dr. Deron Caplan

In January 2019 Flowr Corporation, a Canadian Licensed Producer of cannabis and cannabis-related products, announced that it hired Dr. Deron Caplan, as their director of plant science. He is considered the first person in North America to have earned a Doctor of Philosophy degree (PhD) in cannabis horticulture from the University of Guelph. He was awarded this degree back in August 2018 and his research focused on indoor cannabis production using a variety of growing mediums. He has also spoken to the Canadian Senate and its Standing Committee on Agriculture and Forestry concerning cannabis production (4). His research has led to some interesting findings.

Young Cannabis Plants

Proven Grow Tips

  1. Over-Fertilization in Late Flower

    Over-fertilization of your cannabis plants in the late flower stage may decrease cannabinoid production, but may also increase yield.

  2. Grow Mediums Matter

    In the vegetative stage, a wider range of grow mediums will work fine. In the flower stage, grow mediums work best for cannabis if well aerated and highly porous. This means that your substrate will retain less moisture after irrigation, allowing the cannabis plant’s roots to obtain oxygen. Coconut coir is an environmentally sustainable growing medium that is popular and works exceptionally well for cannabis as long as it is sourced correctly.

Potting Young Cannabis Seedlings

  1. Drought Stress

    Let your plants wilt slightly in late flower especially around week 7 to increase cannabinoids and terpenoids. You might worry that cutting back on the water would limit your plant’s growth, But Dr. Caplan found that a little water stress during the flowering stage doesn’t affect your overall yield when you harvest. Water stress also goes by drought stress and is a slight water deprivation that can improve overall potency of cannabis buds. Do not let your plants dry out and die though! There is a difference between allowing the substrate to dry out and letting the plant dry out. Each strain will deal with different levels of drought stress differently.

“When drought was applied over a period of ≈8 days during week seven, cannabinoid content was similar to a well-watered control.” (3).
  1. Cutting Leaf Tips Off Clones

    When cloning cannabis plants, it has been common practice for some growers to cut the tips off of the leaves of clone cuttings prior to placing into a cube. According to research conducted on the Wappa strain of cannabis, removing leaf tips reduced the rooting success rate from 71% to 53% without influencing root quality overall (2). This point is still controversial and needs further research into whether you should or should not cut the leaf tips off of cuttings for cloning propagation.


  1. CBC Radio. (2018). “Cultivating Cannabis: 5 tips on how to grow your own a bit better at home”. Canadian Broadcasting Channel.

  2. Caplan, Deron., Dixon, Mike. (2018). “Vegetative propagation of cannabis by stem cuttings: Effects of leaf number, cutting position, rooting hormone, and leaf tip removal”. Research Gate.

  3. Caplan, Deron., Dixon, Mike. (2018). “Propagation and Root Zone Management for Controlled Environment Cannabis Production”. Research Gate.

  4. (2018). “Environmental Scientists on the Impact of Composting Cannabis”. CPAC, In Committee from the Senate of Canada.

Comments powered by Talkyard.