Magnesium Lockout in Cannabis
Magnesium Lockout in Cannabis often shows up when nutrients are present in the medium but the plant still cannot use them efficiently. The fastest path is to review pH, salt buildup, root health, and watering habits together.
Magnesium Lockout in Cannabis? See causes, how to tell, and what to check next.
Common Causes
- pH drift outside the ideal uptake range
- Salt buildup around the roots
- Compacted or oxygen-poor root zone
- Stress from overwatering, heat, or transplant shock
How to Tell Which One You Have
Magnesium Lockout in Cannabis often mimics multiple deficiencies at once. If the plant is being fed but symptoms keep spreading, treat the root zone and pH as the first checkpoints before adding more nutrients.
FAQ
Can lockout happen even with a full feeding schedule?
Yes. A plant can look deficient while nutrients are still present if pH, salts, or root stress are blocking uptake.
Should I flush first?
Flush only when runoff, salt buildup, or pH readings support it. A blind flush can slow recovery if the root zone is already weak.
What confirms lockout best?
Runoff pH and EC, root health, and a symptom pattern that affects multiple nutrients at the same time are strong clues.