Plant health 7 min read
Plant healthDeficiency or Lockout? Reading the Leaves
This is the lesson the whole level has been building toward. You've learned the air (2. 2–2. 4), the medium (2. 5), the door (2. 6) and the food (2. 7).
Level 2 · Skilled Grower
Level 2 
Skilled Grower
The science layer — light, nutrition, environment, water.
8 lessons · 5 topics · 10 optional deep-dives
0 of 5 topics complete
Environment 8 min read
EnvironmentEnvironment: The Air Is Doing Half the Work
You can photograph a leaf. You can photograph a root if you tip the pot out.
Level 2 · Skilled Grower
Environment 8 min read
Extraction and the Irish Problem
Two lessons ago you learned the air does half the work.
Level 2 · Skilled Grower
Nutrition 7 min read
NutritionFeeding for Real: EC and the Trend
Last lesson, pH decided whether food gets through the door.
Level 2 · Skilled Grower
Nutrition 7 min read
pH: The Bouncer at the Nutrient Door
You can do everything right at the feeding bench — perfect ratios, premium nutrients, measured to the millilitre — and still watch the plant starve in front of you.
Level 2 · Skilled Grower
Water & media 8 min read
Water & mediaSoil, Coco, and What Roots Want
Here's the line that took me three dead plants to believe: roots need air more than they need water.
Level 2 · Skilled Grower
Training 8 min read
TrainingTraining I: Bend, Don't Break
A plant left to its own devices grows like a Christmas tree: one tall main cola hogging the light at the top, a ring of runts underneath sitting in its shadow.
Level 2 · Skilled Grower
Environment 7 min read
VPD Without the Physics Degree
VPD. Three letters that have launched a thousand panicked forum threads.
Level 2 · Skilled Grower
Going deeper Advanced · optional
The science behind the skilled grower lessons — research-grade deep-dives for when you want the full picture. Skip them and you'll still grow great bud; read them and you'll understand exactly why.
Water & media 10 min read
Which growing medium forgives your watering?
The medium is not just a container for roots.
Level 2 · Skilled Grower
Light 9 min read
LightWhat your plant actually does with light
Here's the foundation: plants don't absorb light the way your eyes perceive it.
Level 2 · Skilled Grower
Nutrition 10 min read
How much to feed in flower (and where it's wasted)
The conventional wisdom says PK boosters drive flower size. Buy the bottle with the big numbers, push it in weeks 3–6, and watch the buds pack on. Sounds good.
Level 2 · Skilled Grower
Nutrition 11 min read
What a hungry plant is trying to tell you
Visual deficiency charts have been part of grow guides for thirty years. They're everywhere. The problem: most of them were never validated on cannabis.
Level 2 · Skilled Grower
Nutrition 10 min read
Organic or mineral — does the plant care?
Most growers feed to the ceiling. The bottle says 300 ppm nitrogen in flower, so they run 300. Or higher. The assumption: maximum input produces maximum yield.
Level 2 · Skilled Grower
Light 8 min read
Is 12/12 the only way to flower?
The 12/12 photoperiod is ubiquitous in flower rooms because it works — and because no one bothered to test the alternatives properly.
Level 2 · Skilled Grower
Training 9 min read
More plants, or bigger plants?
Plant density and architecture directly control the chemical gradient within your canopy.
Level 2 · Skilled Grower
Light 8 min read
Does UV-B really boost potency?
The narrative around UV-B supplementation is compelling: cannabis evolved in high-altitude environments with intense UV-B; trichomes function as sunscreen; therefore, more…
Level 2 · Skilled Grower
Water & media 9 min read
Can you stress a plant into more potency?
There's persistent forum wisdom that restricting water in the final weeks triggers a stress response that increases resin and potency.
Level 2 · Skilled Grower
Light 9 min read
How much light is enough?
The research on light intensity and cannabis yield is unambiguous.
Level 2 · Skilled Grower
This level is one rung of the free certification path — four levels, quizzes and rank seals, no paywall.