Vegetable Diagnostic Center: Identify and Fix Plant Problems
IT Management Professional | Systems-Driven Gardener | NPO Director
Evergreen Hideout Agricultural Services (NPO: 2024/380375/07)
Last Updated: August 2026 • Soshanguve, Pretoria🔬 Vegetable Diagnostic Center & Real Grow Archive
Welcome to the Evergreen Hideout Diagnostic Center — your one-stop resource for identifying and fixing plant problems in the South African Highveld. Below you'll find a complete guide to common vegetable issues, followed by the full Real Grow Series archive documenting our journey from overgrown land to productive food system.
🌱 Quick Navigation:
🔬 Vegetable Diagnostic Center
Identify the problem, find the cause, and fix it — fast. Based on my 5+ years of gardening in the Gauteng Highveld.
⚠️ Important:
This guide is based on my personal experience in Soshanguve. Your results may vary. For serious outbreaks, consult your local agricultural extension office.
🍃 Leaf Problems
Symptoms: Leaves turn pale green or yellow, starting with older leaves. Veins may stay green while the rest of the leaf yellows.
Possible Causes: Nitrogen deficiency (most common), overwatering (roots drowning), or poor drainage.
Fix:
- Nitrogen deficiency: Apply fish fertilizer (1:10 dilution) as a soil drench. New growth should turn green within 5–7 days.
- Overwatering: Stop watering until the top 5cm of soil is dry. Improve drainage by raising beds or adding compost.
- Poor drainage: Add organic matter (compost, well-rotted manure) to improve soil structure.
From the field: "I once lost a row of chard to overwatering. The leaves turned yellow, the roots rotted, and I had to replant. Now I always check soil moisture before watering."
Symptoms: Leaf tips or edges turn brown and crispy. Often starts at the tip and works backward.
Possible Causes: Underwatering, heat stress, fertilizer burn, or salt buildup in the soil.
Fix:
- Underwatering/Heat stress: Water deeply (1–2 liters per plant) and apply a thick mulch layer (8–10cm) to retain moisture.
- Fertilizer burn: Stop fertilizing. Flush the soil with water (5–10 liters per square meter). Reduce fertilizer concentration next time.
- Salt buildup: Leach the soil by watering deeply and allowing it to drain. Use rainwater if possible.
Symptoms: Small or large holes in leaves. You may see the pests or their droppings (frass).
Possible Causes: Caterpillars (cabbage worms, armyworms), flea beetles, or slugs/snails.
Fix:
- Caterpillars: Hand-pick and remove. Apply BT spray (Bacillus thuringiensis) for organic control.
- Flea beetles: Apply diatomaceous earth around the base of plants. Use floating row covers.
- Slugs/Snails: Beer traps (sink a shallow lid filled with beer). Hand-pick at dusk.
From the field: "Cutworms destroyed my first cauliflower planting. I lost 12 seedlings overnight. Now I always use cardboard collars — they cost nothing and work."
Symptoms: White or grey powdery spots on leaves. Starts on lower leaves and spreads upward.
Possible Causes: High humidity, poor air circulation, or overhead watering. Common on brassicas (cabbage, cauliflower, kale).
Fix:
- Milk spray: Mix 40% milk with 60% water. Spray on affected leaves every 5 days.
- Remove affected leaves: Dispose of them in the trash (not compost).
- Improve airflow: Ensure spacing is at least 30–45cm between plants. Water at the base, not overhead.
🌱 Root & Soil Problems
Symptoms: Leaves droop and wilt even when the soil is moist. Plants look stressed.
Possible Causes: Root rot (overwatering), compacted soil, or root-bound plants (in containers).
Fix:
- Root rot: Stop watering. Let the soil dry out. Improve drainage by adding compost or sand.
- Compacted soil: Loosen the soil with a garden fork without damaging the roots. Add organic matter.
- Root-bound: Transplant to a larger container or into the ground. Gently tease apart the roots.
Symptoms: Beetroot, carrots, or onions are small, misshapen, or forked.
Possible Causes: Overcrowding, compacted soil, or inconsistent moisture.
Fix:
- Overcrowding: Thin seedlings to the correct spacing (10cm for beetroot, 2–3cm for carrots).
- Compacted soil: Loosen soil deeply (15–20cm) before planting. Add compost or sand.
- Inconsistent moisture: Water deeply and consistently. Mulch to retain moisture.
🐛 Pest Problems
Symptoms: Small green, black, or white insects on leaf undersides. Leaves curl and become sticky (honeydew).
Possible Causes: Aphid infestation. They reproduce quickly in warm weather.
Fix:
- Soapy water spray: 1 teaspoon castile soap per 1 liter of water. Spray every 3 days until gone.
- Blast with water: Strong jet of water knocks aphids off the plant.
- Plant alliums nearby: Garlic, onions, and chives repel aphids.
- Beneficial insects: Ladybugs and lacewings eat aphids. Attract them with dill, fennel, or marigolds.
Symptoms: Seedlings are cut off at the soil line and found lying on their side. Damage appears overnight.
Possible Causes: Cutworm caterpillars that live in the soil and emerge at night.
Fix:
- Cardboard collars: Cut 5cm circles from cardboard, slit to the center, and place around each stem. Works 90% of the time.
- Diatomaceous earth: Sprinkle a ring around each plant.
- Hand-picking: Dig 2–3cm around damaged plants at dawn to find and remove cutworms.
From the field: "I lost 12 cauliflower seedlings to cutworms. Now I never plant without cardboard collars."
🌦️ Environmental Stress
Symptoms: Plants suddenly produce flower stalks. Leaves become bitter and tough. Common in lettuce, spinach, and brassicas.
Possible Causes: Temperature stress (cold spell followed by warm spell) or increasing daylength (spring).
Fix:
- Harvest immediately: Once a plant bolts, it won't recover. Harvest all remaining leaves and use them fresh.
- Prevention: Plant bolt-resistant varieties. Time your planting for autumn/winter harvests.
Symptoms: Plants are smaller than expected. Leaves are pale or yellow. Growth is slow.
Possible Causes: Low soil temperature, insufficient nutrients, poor root development, or compacted soil.
Fix:
- Low soil temperature: Apply mulch (8–10cm) to insulate the soil. Use raised beds for warmer soil.
- Insufficient nutrients: Apply fish fertilizer (1:10) or compost tea.
- Compacted soil: Loosen the soil with a garden fork. Add organic matter.
🥕 Fruit & Bulb Problems
Symptoms: Garlic bulbs are small (under 3cm diameter). Plants may have lots of leaves but small bulbs.
Possible Causes: Too much nitrogen (excess leaves, small bulbs), planted too shallow, or harvested too early.
Fix:
- Too much nitrogen: Stop using fish fertilizer on garlic. Switch to fruit fertilizer (high potassium) in August.
- Planted too shallow: Plant cloves 5cm deep next time.
- Harvest too early: Wait until 50% of leaves have died back before harvesting.
From the field: "I used fish fertilizer on garlic once — huge leaves, tiny bulbs. Now I only use slow-release compost."
📚 The Real Grow Series — Complete Archive
What started as an overgrown piece of land at Raikana Primary School has become a thriving organic vegetable system — and we've documented every step. Here's the full journey:
🌱 Series Status: Ongoing
New posts added weekly. Follow along as we move toward harvest and regeneration.
🛠️ Phase 1: Site Preparation (Posts 1–5)
Who I am, why I'm doing this, what the land looks like, and what constraints I identified.
Read Part 1 →How I cleared the overgrown site using a pick-mattock — tool selection, technique, and safety.
Read Part 2 →Moving below the surface — loosening compacted soil and removing perennial grass roots.
Read Part 3 →Building permanent raised beds — the foundational system architecture.
Read Part 4 →Applying a thick mulch layer to protect the soil, retain moisture, and suppress weeds.
Read Part 5 →🌱 Phase 2: Planting the Crops (Posts 6–8)
The first crop — 42 garlic cloves planted using sprouted cloves and precise spacing.
Read Part 6 →Planting 18 Swiss chard seedlings for continuous cut-and-come-again harvests.
Read Part 7 →Planting spring onion seedlings in clusters — the "middleware" crop.
Read Part 8 →🧪 Phase 3: Soil Building & Feeding (Posts 9–13)
Manual weed management protocols — identifying, removing, and preventing weeds without chemicals.
Read Part 9 →Applying fish-based liquid fertilizer to feed the crops and activate soil biology.
Read Part 10 →Building a thermophilic compost pile from cleared weeds and grass.
Read Part 11 →Sourcing high-nitrogen chicken feathers to supercharge the compost pile.
Read Part 12 →Applying finished feather compost as a top-dressing — protecting the soil and feeding the plants.
Read Part 13 →🌿 Phase 4: Expanding the Garden (Posts 14–16)
Planting 660 purple onions — the largest planting yet.
Read Part 14 →Planting cauliflower seedlings — the "diva" crop.
Read Part 15 →Propagating new kale plants from side shoots — turning one plant into many.
Read Part 16 →📊 Phase 5: Mid-Season Growth Audits (Posts 17–24)
Tracking leaf development, harvest weights, and overall health of the chard crop.
Read Part 17 →Checking garlic leaf development, stem thickness, and bulb formation.
Read Part 18 →Propagating and transplanting leek seedlings for long white shafts.
Read Part 19 →Harvesting spring onions using the cut-and-come-again method for continuous yield.
Read Part 20 →Scouting cauliflower for pests, disease, and head formation progress.
Read Part 21 →Transplanting beetroot seedlings — the first root crop in the series.
Read Part 22 →Checking beetroot leaf development and root establishment — no bulbs yet!
Read Part 23 →Tracking kale growth and applying the second batch of chicken feather compost.
Read Part 24 →🏆 What We've Achieved So Far
- 42 garlic cloves — growing steadily for a December harvest
- 18 Swiss chard plants — producing 2.5kg+ of harvests so far
- 660 purple onions — enough to feed multiple families
- 12 cauliflower plants — entering head formation
- Kale cuttings — propagated from side shoots
- Leeks — planted for long white shafts
- Thermophilic compost — built from cleared weeds and chicken feathers
- Zero synthetic inputs — 100% organic, 100% locally sourced
Join the Journey From Zero
New posts added weekly — follow along as the garden grows from clearing to harvest.
Join the Newsletter📺 Also available on YouTube — watch the garden grow in real time.
NPO Registration: 2024 / 380375 / 07
📍 Soshanguve, Pretoria, South Africa
© 2026 Evergreen Hideout. Systems-driven gardening for a resilient South Africa.
