Heat stress. It's an autoflower strain that flowers/buds without changes in light in 90 days. The strain originated from northern Russia/Asia where they grow fast under the 24/7 sunlight there. So they don't tolerate heat well.
Because C. ruderalis transitions from the vegetative stage to the flowering stage with age, as opposed to the light cycle required with photoperiod strains, it is bred with other household sativa and indica strains of cannabis to create "auto-flowering cannabis strains".[14] These strains are favorable for cultivars because they exhibit the hardiness of ruderalis plants while still maintaining the medicinal effects of sativa and indica strains.[15] Cultivators also favor ruderalis plants due to their reduced production time, typically finishing in 3-4 months rather than 6-8 months. The auto-flowering trait is extremely beneficial because it allows for multiple harvests in one outdoor growing season without the use of light deprivation techniques necessary for multiple harvest of photo-period strains. A