Understanding VPD
Why rules of thumb always fail — formulas, target values and the leaf temperature correction.
PPFD & DLI — Understanding Light
Why watt ratings tell you nothing and which two numbers actually matter.
Raspberry Pi as Grow Controller
Architecture, sensors and the most common mistakes in DIY grow controllers.
Building a Growbox — Material Comparison
Wood, aluminium profile or 3D print — honest comparison without marketing speak.
PWM Fan Control in Your Grow
Why 25 kHz is the difference between silent and unbearable.
Hydro & Fluidics — Autonomous Irrigation
Weight-based irrigation logic: load cell, pump control, 4L quick-release tank.
DIY vs. Ready-Made System
Cost comparison, abandoned hardware problem and when building really makes sense.
Watering correctly — why your instinct always lies
Weight-based watering, capillary forces and why the finger test systematically fails.
Temperature & Humidity — why two numbers are not enough
Why isolated readings without VPD tell you nothing about your climate — with worked examples.
What does a 50–80 watt LED setup actually deliver
Why watts are not light output — PPFD, µmol/J and honest electricity cost calculation.
Training Methods — LST, Topping and SCROG in a small setup
Which method for which compact setup — recovery times, risks and SCROG timing.
Germination — the controlled start without experiments
What the seed actually needs — methods, RootCore Cup and the most common mistakes.
Nutrients — what plants actually need and what is marketing
NPK explained physically, EC and pH as control variables, deficiency diagnosis as logic.
Harvest & Ripeness — trichomes, weight and the right time
Three ripeness indicators, harvest window, flushing assessment and the load cell curve.
Soil, Coco or Hydro — which substrate for which setup
Water retention, buffer capacity, error tolerance — compared as systems, not products.
How a Material Test Became a Lithophane Generator
Light transmission, filament and the unplanned side effect of genuine curiosity.
Home Growing in Germany — CanG 2024
3-plant rule, possession limits, Cannabis Social Clubs and practical consequences.
DLI Calculator — Daily Light Integral for Every Growth Stage
Formula, interactive calculator and PPFD × hours combination table for all growth stages.
PPFD Table — Target Values for Veg, Flower and Seedling
Complete PPFD reference by stage, measurement technique, distance table and CO₂ interaction.
Buy or Build a Grow Box — Cost Comparison 2025
Ready-made vs. DIY build: component prices, time investment, quality comparison and decision matrix.
Irrigation Water — pH, EC and Water Quality
Why pH 6.8 in the wrong substrate starves your plants — EC, buffer capacity, tap water vs. osmosis and the meters that actually matter.
Transplanting Cannabis — when, how, and the most common mistake
Too early stunts root development. Too late creates root-bound plants. The right method — with weight indicator, root check and stress-free transfer.
Drying & Curing Cannabis — the phase that determines quality
Dried too fast, you lose terpenes. Cured wrong, no aromas develop. Temperature, humidity, duration — the physics behind perfect post-harvest treatment.
Fabric Pots — the physics behind air pruning
Why fabric pots are more than a trend — air pruning mechanism, oxygen at the root, optimal wall thickness and when hard plastic is the better choice.
Genetics & Strains — what Indica, Sativa and Hybrid really mean
Indica vs. Sativa is a marketing term, not a botanical concept. What phenotype, genotype, terpene profile and photoperiodism actually determine — and how to choose for your compact setup.
Indoor Growing — the complete setup concept before the first seed
Before the first seed germinates: space, light cycle, ventilation concept, irrigation strategy and automation — the complete planning concept for a serious indoor grow.
What is Cannabis — the plant without myths
Cannabis sativa, cannabinoids, terpenes and the endocannabinoid system — explained factually without half-knowledge.
Cannabis Plant Anatomy — structure as function
How the cannabis plant is structured — trichomes, pistils, calyxes, stomata and why the plant architecture determines your grow decisions.