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Cannabis Grow Guide

Articles

  • Close-up of a female cannabis flower densely covered in pale glandular trichomes.

    Trichomes: What Are They Actually For?

    · Maarten Casteleijn

    Growers use trichomes to judge harvest time. But trichomes did not evolve for us. What are these tiny resin factories actually for, and what do...

  • Research photographs comparing green, purple and red Cannabis petioles, green and purple leaves, and green and purple female flowers. Bassolino et al. (2023), Figure 1.

    Cannabis Colour Changes: Genetics, Nutrition or Stress?

    · Maarten Casteleijn

    Purple leaves, red petioles and yellow fan leaves do not follow a simple diagnostic colour code. Explore how genetics, anthocyanins, temperature, nutrient stress and senescence...

  • Side view of a flowering Cannabis shoot with leaves angled upward around the flower, photographed by XRP Relic.

    Why Do Cannabis Leaves Pray?

    · Maarten Casteleijn

    Raised Cannabis leaves can accompany healthy growth, but they are not a light, watering or VPD meter. Explore how genetics, light signals, daily rhythms, water...

  • Research photographs showing initial, intermediate and advanced manganese, boron and copper deficiency symptoms in Cannabis T1, including yellowing and distorted or curled leaves. Cockson et al. (2019), Figure 4.

    Why Do Cannabis Leaves Taco or Curl?

    · Maarten Casteleijn

    Tacoing, clawing and curling describe leaf shapes, not diagnoses. Learn how water balance, light, leaf temperature, VPD, roots, nutrients and pests can interact, and how...

  • Four photographs comparing Incredible Milk and Gorilla Glue cannabis plants grown under 12-hour and 13-hour photoperiods shortly before harvest.

    When Should You Flip Cannabis to Flower?

    · Maarten Casteleijn

    The right time to flip photoperiod-sensitive Cannabis depends on plant size, available space, genotype, health and expected stretch, not a fixed number of vegetative weeks....

  • Cannabis shoot and whole-plant photographs with stem and branch elongation measurements under long-day and short-day photoperiods, from Alter et al. (2024), Figure 1.

    Why Does Cannabis Stretch?

    · Maarten Casteleijn

    Cannabis stretch is not one response. Explore how genetics, light intensity, red:far-red signals, flowering hormones, temperature and humidity influence internode elongation.

  • Whole cannabis plant at harvest laid out beside a measuring scale, showing branching and flowers at different positions.

    Why Are My Cannabis Buds Airy?

    · Maarten Casteleijn

    Airy cannabis flowers are not simply a shortage of PK. Explore how genetics, light distribution, heat, nutrition, roots and maturity shape inflorescence development.

  • Cannabis flowers in open glass jars and other display containers at a dispensary counter.

    Jars, Grove Bags or Humidity Packs: What Actually Works?

    · Maarten Casteleijn

    Compare glass jars, multilayer bags, Grove Bags and humidity packs through the variables that matter: water activity, oxygen, temperature, light and storage time.

  • Close-up of a dried cannabis flower with visible trichomes and orange-brown pistils.

    Can Overdried Cannabis Be Saved?

    · Maarten Casteleijn

    Overdried cannabis can absorb moisture again, but water cannot replace lost terpenes. Explore controlled rehydration, humidity packs and the limits of restoring flower quality.

  • Dried cannabis flowers and leaf fragments on a light surface.

    Why Does My Cannabis Smell Like Hay After Drying?

    · Maarten Casteleijn

    Hay-like aroma after drying is not simply chlorophyll leaving the flower. Explore green leaf volatiles, terpene losses and what curing can—and cannot—change.

  • Dried cannabis flower viewed from above in an open glass container.

    Does Cannabis Really Need to Be Cured?

    · Maarten Casteleijn

    Does curing improve cannabis, or is it mostly tradition? Explore what research shows about moisture equilibration, chlorophyll, cannabinoids, terpenes, burping and storage.

  • Harvested cannabis branches hanging upside down from overhead racks in a drying room.

    How to Dry Cannabis Flowers Without Ruining Them

    · Maarten Casteleijn

    Drying cannabis is a balance between moisture removal, microbial risk and aroma preservation. Understand temperature, humidity, airflow, trimming and water activity beyond the 60/60 rule.