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Cannabis Grow Guide

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  • Yellow anthers emerging among female cannabis floral tissues; panel A cropped from Punja and Holmes (2020), Figure 3, with the original 1 mm scale bar.

    Why Does Cannabis Turn Hermaphrodite?

    · Maarten Casteleijn

    A yellow anther in a female cannabis flower is not explained by stress alone. Explore how genetics, ethylene, gibberellins, development and environment shape floral sex...

  • Close-up of cannabis seeds with mottled brown, beige and olive-green shells.

    How Do Feminized Cannabis Seeds Actually Work?

    · Maarten Casteleijn

    Feminized seeds rely on the difference between genetic sex and floral expression. Explore XX and XY chromosomes, ethylene signalling, sex reversal and why feminized does...

  • Close-up of a dense cannabis flower surrounded by serrated green leaves, growing in a greenhouse.

    What Is an Autoflower?

    · Maarten Casteleijn

    What makes autoflowering Cannabis different? Explore photoperiod sensitivity, flowering genetics, FINOLA research and why early growth and daily light dose matter.

  • Cannabis plants photographed from below beneath several brightly illuminated grow lamps in an indoor cultivation facility in Denver.

    Is It Really Light Burn? PPFD, DLI and Plant Capacity

    · Maarten Casteleijn

    Light stress is about more than PPFD. Understand DLI, canopy photosynthesis and how water, roots, temperature, CO₂, nutrition and acclimation determine the light a cannabis...

  • Cannabis leaf with yellowing between greener veins from the 2 mg/L magnesium treatment in Morad and Bernstein (2023), Figure 1F.

    CalMag: Why Is Everyone Recommending It?

    · Maarten Casteleijn

    Calcium and magnesium do different jobs. Learn when CalMag makes sense, how coco and source water affect supply, and why nutrient balance and root function...

  • Should You Flush Cannabis Before Harvest?

    Should You Flush Cannabis Before Harvest?

    · Maarten Casteleijn

    Pre-harvest flushing is not the same as leaching excess salts. Explore what research shows about nutrient withdrawal, yield, cannabinoids, taste and fertilizer-use efficiency.

  • Cannabis flower with brown necrotic tissue and grey fungal growth, shown as Botrytis bud rot in Buirs and Punja (2024).

    Bud Rot: Why Cannabis Flowers Create the Perfect Microclimate for Botrytis

    · Maarten Casteleijn

    The climate inside a dense cannabis flower can differ sharply from the grow room. Explore how humidity, airflow, flower structure and time shape Botrytis risk.

  • Overwatered or Underwatered? Understanding Cannabis Droop

    Overwatered or Underwatered? Understanding Cannabis Droop

    · Maarten Casteleijn

    A drooping cannabis plant does not always need more water. Learn how pot weight, root-zone moisture, oxygen and water use help distinguish underwatering from overwatering.

  • Hand holding a red digital pH meter with its probe in water; the display reads 4.96.

    pH, EC, Water and Nutrient Lockout in Cannabis

    · Maarten Casteleijn

    Nutrients can be present without being accessible. Explore how pH, EC, water, oxygen and root function interact to determine nutrient uptake in cannabis.

  • Cannabis plant in a pot with prominently yellowing leaves and greener foliage in the background.

    What’s Wrong With My Cannabis Plant?

    · Maarten Casteleijn

    Yellow leaves do not automatically mean a nutrient deficiency. Learn to check environment, water, roots, EC and pH before reaching for another bottle.

  • Close-up of a cannabis flower densely covered in glandular trichomes, with curled stigmas and surrounding green leaves.

    When Is Cannabis Really Ready to Harvest?

    · Maarten Casteleijn

    Trichome colour is a useful maturity indicator, not a chemical test. Learn how trichomes, pistils, flower maturity and genetics together define the harvest window.