Must-have visual guide

Plant deficiencies with arrows and organic cures.

Use these annotated photos to compare symptoms, then correct gently. Visual symptoms overlap, so check watering, roots, pH, soil age, and fertilizer history before treating.

Diagnosis warning: A leaf photo is a clue, not proof. Many deficiencies look like overwatering, root rot, pH lockout, pests, heat, cold, or salt buildup.

Deficiency cards

Search or filter the cards. Each card includes a real photo, an arrow callout, symptoms, organic remedies, and a caution.

Real plant photo for Nitrogen deficiency Older yellowing lower leaves
Must-haveDeficiency

Nitrogen deficiency

What to look for: Older/lower leaves pale first, overall weak growth, thin stems, slow recovery.

Organic response:

  • Top-dress with finished compost or worm castings.
  • Use diluted fish emulsion or alfalfa meal during active growth.
  • Add grass-clipping mulch outdoors when appropriate.
  • Avoid waterlogged soil because roots cannot feed properly.

Watch-out: Do not keep adding nitrogen if the plant is in low light, dormant, or already lush and floppy.

Image/source reference 路 Wikimedia Commons / nitrogen-deficient cabbage image

Real plant photo for Phosphorus deficiency Purple/dark lower growth
Must-haveDeficiency

Phosphorus deficiency

What to look for: Dark green, red, or purple older foliage; slow roots; delayed flowering or fruiting.

Organic response:

  • Use bone meal or fish bone meal where soil tests show low phosphorus.
  • Use compost and mycorrhiza-friendly practices.
  • Keep roots warm; cold wet soil can block uptake.
  • Maintain soil pH near the plant's preferred range.

Watch-out: Do not overuse phosphorus; excess can lock out micronutrients.

Image/source reference 路 Wikimedia Commons / phosphorus deficiency on corn

Real plant photo for Potassium deficiency Scorched leaf edge
Must-haveDeficiency

Potassium deficiency

What to look for: Brown leaf edges, tip burn, weak stress tolerance, poor fruit quality.

Organic response:

  • Use kelp meal or liquid seaweed.
  • Use sulfate of potash-magnesia only when appropriate.
  • Add compost to improve nutrient holding.
  • Keep watering steady because dry soil limits uptake.

Watch-out: Wood ash can add potassium, but it raises pH; avoid on alkaline soil or acid-loving plants.

Image/source reference 路 Wikimedia Commons / tomato potassium-deficiency leaf

Real plant photo for Calcium deficiency Blossom-end rot spot
Must-haveDeficiency

Calcium deficiency

What to look for: New growth distortion, tip burn, weak growing points, blossom-end rot in tomatoes and peppers.

Organic response:

  • Water consistently; calcium movement depends on steady moisture.
  • Use gypsum where calcium is needed without raising pH.
  • Use dolomitic lime only if soil pH and magnesium needs fit.
  • Mulch outdoor beds to stabilize moisture.

Watch-out: Do not assume blossom-end rot always means low soil calcium; inconsistent watering is often the trigger.

Image/source reference 路 Wikimedia Commons / blossom-end rot image

Real plant photo for Iron deficiency Yellow new leaves
Must-haveDeficiency

Iron deficiency

What to look for: New leaves yellow while veins stay greener; common when pH is too high.

Organic response:

  • Check pH first.
  • Use compost and acid-appropriate potting media.
  • Use organic-approved chelated iron if confirmed.
  • For acid-loving plants, use pine bark-based mixes and avoid lime-heavy water.

Watch-out: Adding iron without fixing pH often gives only temporary results.

Image/source reference 路 Wikimedia Commons / iron chlorosis on lemon

Real plant photo for Magnesium deficiency Yellowing between veins
Must-haveDeficiency

Magnesium deficiency

What to look for: Older leaves show yellowing between veins while veins stay green; may look marbled.

Organic response:

  • Use compost mulch to reduce leaching.
  • Use Epsom salt lightly only when magnesium deficiency is likely.
  • Use dolomitic lime if pH is low and magnesium is also needed.
  • Balance potassium feeding because excess potassium can worsen magnesium issues.

Watch-out: Do not use Epsom salt as a universal cure; it can create nutrient imbalance.

Image/source reference 路 Wikimedia Commons / interveinal chlorosis example

Real plant photo for Sulfur deficiency Pale newer growth
Should-haveDeficiency

Sulfur deficiency

What to look for: New leaves pale evenly; plant may look washed-out rather than spotted.

Organic response:

  • Use compost or gypsum if sulfur is low.
  • Use elemental sulfur carefully for long-term pH lowering.
  • Use organic fertilizers containing sulfur when suitable.
  • Retest before repeating.

Watch-out: Sulfur changes soil slowly; heavy applications can overshoot pH.

Image/source reference 路 Wikimedia Commons / chlorosis symptom example

Real plant photo for Zinc deficiency Small chlorotic leaf area
Should-haveDeficiency

Zinc deficiency

What to look for: Small leaves, short internodes, distorted new growth, and patchy chlorosis.

Organic response:

  • Use compost and kelp meal.
  • Avoid excess phosphorus.
  • Correct high pH if zinc is locked out.
  • Use zinc amendments only after testing or strong confirmation.

Watch-out: Micronutrients are easy to overapply; do not guess with high-dose zinc.

Image/source reference 路 Wikimedia Commons / chlorosis symptom example

Real plant photo for Boron deficiency Growing tissue disorder area
Should-haveDeficiency

Boron deficiency

What to look for: Growing tips die back, brittle new growth, poor fruit set, hollow or cracked stems in some crops.

Organic response:

  • Use compost and seaweed products for gentle trace support.
  • Keep soil evenly moist.
  • Apply boron only from a soil-test recommendation.
  • Use crop-specific rates because boron toxicity happens easily.

Watch-out: Never freehand borax; the safe range is narrow.

Image/source reference 路 Wikimedia Commons / fruit disorder reference image

Real plant photo for Manganese deficiency Interveinal chlorosis
Should-haveDeficiency

Manganese deficiency

What to look for: Interveinal yellowing with small necrotic specks; often tied to high pH.

Organic response:

  • Check pH and drainage.
  • Use compost and acidifying organic matter where suitable.
  • Use manganese sulfate only with test-backed need.
  • Avoid over-liming.

Watch-out: Can be confused with iron or magnesium problems; confirm before treating.

Image/source reference 路 Wikimedia Commons / interveinal chlorosis example