How do I fix nitrogen deficiency on cannabis?

Older, lower leaves turn pale yellow and eventually fall off as nitrogen is mobilized to newer growth. Overall plant growth is stunted and yields are reduced. Increase the dose of a complete base nutrient with adequate nitrogen. Verify and adjust pH to optimal range. Repot or top-dress depleted soil.

Visual Guide

Nitrogen Deficiency.

Increase the dose of a complete base nutrient with adequate nitrogen

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Photo

Deficiencies

Older, lower leaves turn pale yellow and eventually fall off as nitrogen is mobilized to newer growth. Overall plant growth is stunted and yields are reduced.

Looks like this

Lower, older leaves yellowing first
Leaves dropping from the bottom up
Slow, stunted growth and pale upper canopy in severe cases

Solve it with Vitaponix

VitaBase →

Growth-phase base nutrient, 2–6 ml/L in weeks 1–6. Strongly reduces the need to flush mid-cycle.

How to fix it

Increase the dose of a complete base nutrient with adequate nitrogen
Verify and adjust pH to optimal range
Repot or top-dress depleted soil

Why it happens

Underfeeding with base nutrient
Old or depleted growing medium
Low pH locking out nitrogen uptake

Prevent it

Follow a structured feeding schedule from seed to harvest
Use a complete base nutrient at every watering during veg
Monitor plants weekly for early colour changes

Official feeding chart

Target pH (official chart): 5.8 – 6.3
VitaBase: 2–6 ml/L, weeks 1–6

Doses and targets come from the official Vitaponix feeding chart. Vitaponix nutrients are plant nutrition, not pesticides or fungicides.

Prevent it next time

Get the full 10-week feeding schedule.

Open the feeding chart Shop Vitaponix →