Start healthy
Compare the whole plant first.
Each chart starts with a healthy reference. Compare leaf age, posture, color, and canopy distribution before treating a single mark or dark leaf as a meaningful pattern.
Grow Guides / Field guide
Nutrient toxicity field guide.
Start with the healthy reference, then watch where a possible excess pattern appears and how it develops. These visual references help you investigate without turning one signal into a certain answer.
Explore the six guidesGrowlytics
Field guide / six visual references
Nutrient toxicity field guide.
Potential excess-pattern cues organized for calmer comparisons and root-zone context checks.
NPKCaMgFe
Read the pattern — not just the leaf
Potential excess signals can overlap with lockout, pH, EC, watering, and environmental stress.Read the pattern, not one leaf
Toxicity and deficiency can look similar.
Deficiency references focus on patterns associated with limited availability. This guide focuses on possible excess-pattern cues. Both can overlap with uptake problems, so symptoms alone do not establish the cause.
Keep the context
Excess is not the only explanation.
These signals can overlap with nutrient lockout, pH or EC imbalance, watering and root-zone conditions, light or heat stress, and broader environmental factors. Use the pattern as an observation prompt, not a diagnosis or a treatment instruction.
Six nutrient references
Follow the signal through its stages.
01N
Nitrogen
First signal: Older fan leaves, then potentially the whole canopy.
Open visual guide02P
Phosphorus
First signal: Older leaves and petioles.
Open visual guide03K
Potassium
First signal: Leaf edges, often on older leaves.
Open visual guide04Ca
Calcium
First signal: Newest growth and the root zone.
Open visual guide05Mg
Magnesium
First signal: Older leaves, especially tissue between veins.
Open visual guide06Fe
Iron
First signal: Newest growth.
Open visual guideNeed a second look?
Add a photo to your grow record.
Scan a plant photo for AI-guided visual observations and keep the result alongside your grow history. A scan provides guidance, not a guaranteed diagnosis.