Potassium deficiency guide image
Plant deficiency guide

Potassium deficiency

What it looks like: Leaf edges yellow, brown, or scorch; weak stems; poor heat and drought tolerance.

What it looks like: Leaf edges yellow, brown, or scorch; weak stems; poor heat and drought tolerance.Organic cure list: Prevention note: Do not overuse wood ash unless pH is low enough to handle it.

Quick facts

What it looks like: Leaf edges yellow, brown, or scorch; weak stems; poor heat and drought tolerance.

Organic cure list:

Prevention note: Do not overuse wood ash unless pH is low enough to handle it.

  • Use kelp meal or liquid seaweed.
  • Use composted plant material.
  • Use sulfate of potash-magnesia when appropriate.
  • Water consistently so nutrients can move into roots.

What to do next

  • Confirm the symptom pattern on new leaves versus older leaves.
  • Check watering, drainage, roots, and pH before adding fertilizer.
  • Start with compost, worm castings, or the gentlest listed organic support.
  • Track new growth for improvement over 1–3 weeks.
  • If the problem continues, test soil or compare with pest and disease signs.

Watch-outs

Do not treat one leaf photo as proof. Nutrient issues often look like watering stress, pH lockout, root damage, heat, cold, or pests.

FAQ

How do I use this plant deficiency guide?

Start with the light, soil, water, symptom, or purpose notes on this page, then make one careful change at a time.

What is the biggest mistake with Potassium deficiency?

Do not treat one leaf photo as proof. Nutrient issues often look like watering stress, pH lockout, root damage, heat, cold, or pests.

When should I get more help?

Get local help if the plant is valuable, symptoms are spreading quickly, or outdoor disease and pest problems may affect nearby plants.