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Diagnose Common Container Plant Problems

Similar symptoms can have more than one cause. Start with the most visible symptom to narrow down the problem in your urban garden setup.

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Yellow Leaves

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Check First: Soil Moisture Stick your finger 2 inches into the soil. If it's soaking wet, you're overwatering. If it's bone dry, underwatering is likely the culprit.

Likely Causes

  • Overwatering (most common in containers)
  • Underwatering (soil has become hydrophobic)
  • Nutrient deficiency (Nitrogen or Iron)
  • Natural ageing (older, lower leaves only)
  • Poor drainage (blocked drainage holes)

What to do

Adjust Watering Routine expand_more

Let the top 2 inches of soil dry out completely before watering again. Ensure water flows freely out the bottom of the pot.

Check Drainage expand_more

Lift the pot. Is it sitting in water? Empty saucers 30 mins after watering. Clear any debris blocking the drainage holes.

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Drooping Plants

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Check First: Weight of the Pot Lift the pot. A very light pot means dry soil. A very heavy pot means waterlogged soil. Both cause wilting.

Likely Causes

  • Underwatering (soil pulled away from pot edges)
  • Overwatering/root rot
  • Heat stress (direct afternoon sun)
  • Transplant shock
  • Root-bound plant needing repotting

What to do

Rehydrate Slowly expand_more

If bone dry, place the pot in a tray of water and let it soak up from below for 30 minutes. Top watering runs off hydrophobic soil.

Check for Root Rot expand_more

Gently unpot. Healthy roots are white/tan. Dark, mushy, foul-smelling roots need trimming. Repot in fresh dry mix.

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No Flowers/Fruit

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Check First: Light Hours Most flowering and fruiting plants need 6-8 hours of direct sunlight. Count the actual hours your spot gets.

Likely Causes

  • Insufficient light
  • Too much nitrogen fertilizer (all leaves, no blooms)
  • Plant is too young or recently transplanted
  • Temperature stress (too hot or cold at night)
  • No pollinators reaching your balcony

What to do

Switch Fertilizer expand_more

Use a bloom-boosting fertilizer higher in phosphorus (the middle number, e.g. 5-10-5) instead of balanced or high-nitrogen feeds.

Hand Pollinate expand_more

For tomatoes and peppers, gently shake the plant or use a small brush to transfer pollen between flowers.

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Pests

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Check First: Undersides of Leaves Most pests hide on the underside of leaves. Check there first before treating.

Likely Causes

  • Aphids (clusters on new growth)
  • Spider mites (fine webbing, stippled leaves)
  • Fungus gnats (tiny flies around soil)
  • Whiteflies (cloud of tiny white insects when disturbed)
  • Scale insects (brown bumps on stems)

What to do

Neem Oil Spray expand_more

Mix 1 tsp neem oil + 1 tsp dish soap in 1 quart warm water. Spray all leaf surfaces every 5-7 days for 3 weeks.

Sticky Traps expand_more

Place yellow sticky traps near affected plants to catch flying pests and monitor population levels.

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Overwatering

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Check First: Drainage Ensure every pot has drainage holes and is not sitting in a saucer of standing water.

Likely Causes

  • Watering on a schedule instead of checking soil
  • Poor drainage or compacted soil
  • Pot too large for the plant
  • No drainage holes in decorative pots
  • Humidity trapping moisture

What to do

Let It Dry Out expand_more

Stop watering until the top 2-3 inches of soil are completely dry. This may take several days.

Improve Drainage expand_more

Add perlite or coarse sand to your potting mix. Ensure drainage holes are clear. Use pot feet to elevate.

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Soil Problems

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Check First: Soil Surface White crusty deposits on the soil surface indicate salt buildup from fertilizer or hard water.

Likely Causes

  • Compacted soil (water pools on surface)
  • Salt buildup from fertilizer
  • Hydrophobic soil (water runs off without absorbing)
  • Depleted nutrients (plant has been in same soil 2+ years)
  • Fungal growth on soil surface

What to do

Flush with Water expand_more

Run water through the pot until it flows freely from drainage for 2-3 minutes to leach out salt buildup.

Repot with Fresh Mix expand_more

Replace the old soil entirely with a fresh, well-draining potting mix. Do this annually for most container plants.

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