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Study highlights day-neutral cannabis density

February 22, 2022  By Phylos

(Photo provided by: Phylos)

A new study has revealed optimal canopy density for highest yield, efficiency and profitability in greenhouse growing environments.

The trial was announced by Phylos alongside its research and cultivation partner, Progressive Plant Research (PPR).

The purpose of this study was to establish the effect of plant density on biomass, extraction yield, cannabinoids, terpenes, and other traits. Findings from this study highlight how optimizing density treatments can improve crop yield, efficiency, and sustainability as well as answer the question, “how dense should my canopy be to maximize yield and profit from my production” often asked by cannabis and hemp growers.


In total, five different density treatments were evaluated using two different pot sizes (one gallon and two gallon) resulting in a sample size of over 1,000 plants and the collection of over 9,200 data points for evaluation.

Data from the study, which was conducted using two varieties of Phylos’ recently introduced day-neutral cannabis genetics, suggests that:

  • Phylos varieties grown in 2-gallon pots at the highest density (0.5 sf/plant spacing) produced more flower biomass and more flower extract yield per unit area. With this treatment, growers can fit 20,000 plants in a 10,000 sf production space.
  • Lower density treatments produced a higher percentage of Grade A flower and can capture a higher price point as top-shelf dispensary flower.
  • Plants in two-gallon pots produced taller, wider plants with larger individual flowers.
  • Cannabinoid content (total THC, minor cannabinoids, and terpenes) remained consistent between all density treatments.
  • Growing at higher densities maximize the usage of production inputs, including electricity, nutrient, and water requirements.

You can see the results of the density trial in this video produced by Phylos.

To view the full report,  please click here.

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