Potassium Deficiency

Brown or scorched-looking leaf margins (edges) starting on older leaves, sometimes with yellowing. Common in mid-to-late flower as potassium demand increases significantly.

What usually causes it

• pH out of range
• Low bloom nutrient EC or insufficient PK boost
• Antagonism from excess calcium or magnesium
• Flush before harvest (intentional - normal)

Related product categories

• Base Nutrients
• PK Boosters

Terms worth knowing

• EC (Electrical Conductivity)
• pH

Walk the questions if you are not sure this is the match. The notes above are the same ones the tool ends on.