Growing & HarvestEinsteiger9 min 4 sourcesUpdated: 2026-03-26
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Cannabis cultivation: the scientific fundamentals

How light, climate and nutrients interact, and why repeatability matters more than hype tricks.

Focus

Climate, light, nutrients

Error source #1

Too many variables at once

Recommended tracking

Daily grow log

Key points

  • Work with stable target ranges instead of daily-changing target values.
  • Measure temperature, RH, pH, EC and light output consistently at fixed intervals.
  • Scale inputs step by step and document every change with a date.

Note

  • Unstable night temperatures increase stress and the risk of mold events.
1

Systems thinking instead of individual tricks

Yield and quality come from stable processes — not from isolated tricks.

Light, climate and nutrients interlock: a change always affects the overall system.

Checklist

  • Define VPD target range per vegetative stage
  • Define measurement points for climate (canopy, room, intake/exhaust air)
  • Weekly review with yield, quality, and issues
2

Why this directly affects your yield and quality

Unstable parameters create stress. Stress costs yield and worsens the terpene profile.

If you don't document measurements, you can't trace causes after a bad run.

3

Data-clean routines

Record feed strength, pH corrections, and watering schedules in a consistent structure.

Only this way can cause-and-effect relationships be reliably assessed later.

4

Relevant in SecretLeaf when

you're starting your first run and don't have a setup protocol

quality or yield fluctuates between runs without an identifiable reason

you want to adjust a variable (light, nutrients, temperature) and want to understand the effect

5

What you should specifically do

Checklist

  • Set fixed measurement points today: temperature, RH, pH, EC — daily at the same time
  • Write every change with a date into the grow log before you make it
  • Change only one variable per week — otherwise you can't isolate causes

Frequently asked questions

Do I need to buy expensive equipment to grow well?
No. What matters is a fixed routine, not the equipment. Cheap sensors with reliable logging beat expensive individual devices.
How often should I take care of the plants?
This depends on the setup. What matters is frequency and consistency: daily observation + weekly measurement + monthly analysis following a fixed routine.

Sources

→ Full register
  1. 1

    Modern Cultivation Techniques and Environmental Control for Cannabis

    Horticulture Research · 2024

    Open ↗
  2. 2

    Vapor Pressure Deficit and Transpiration in Controlled Environments

    Plant Physiology · 2023

    Open ↗
  3. 3

    ASTM D37 Committee Standards on Cannabis

    ASTM International · 2025

    Open ↗
  4. 4

    Curing and Drying: Effects on Secondary Metabolism and Quality

    Postharvest Biology and Technology · 2024

    Open ↗

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Editorial note: The content is for knowledge and education. Regional law, medical questions and regulatory requirements must always be checked separately by qualified professionals.