Cucumber

Cucumis sativus

HardFruit50-70 days
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Overview

Growing cucumbers in NFT systems is challenging due to their aggressive and extensive root systems which can clog standard channels. It requires wide channels (minimum 100mm/4 inches), high oxygenation, and rigorous root management. They are heavy feeders and drinkers, requiring trellis support for the heavy vines.

Growing Requirements

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pH Range

5.5 - 6

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EC Range

1.8 - 2.5 mS/cm

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TDS Range

900 - 1250 ppm

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Temperature

22°C - 28°C

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Light Requirement

High (14 hours/day)

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Nutrient Needs

High Nitrogen during vegetative stageHigh Potassium during flowering and fruitingCalcium to prevent blossom end rotMagnesiumSilica for stem strength

Growth Timeline

1

Germination

3-5 days

Seeds require high humidity and temperatures around 26-29°C to sprout. Use rockwool cubes.

2

Seedling

2-3 weeks

Transplant into the NFT system once roots emerge from the starter plug. Ensure the nutrient film touches the roots but does not submerge the stem.

3

Vegetative

2-3 weeks

Rapid vine growth occurs. Train plants up a trellis string immediately. Prune suckers to maintain a single leader stem if growing vertically.

4

Flowering & Fruiting

Ongoing (4+ weeks)

Flowers appear at nodes. If parthenocarpic, fruit develops immediately. Switch to a bloom formulation nutrient mix.

Common Issues & Solutions

Root Clogging

Symptoms:
  • Nutrient solution overflowing channels
  • Stunted growth due to lack of oxygen
Causes:
  • Aggressive root mass outgrowing the NFT channel size
Solutions:
  • Use extra-wide NFT channels
  • Trim roots carefully (risky)
  • Switch to Dutch Bucket system if clogging persists

Pythium (Root Rot)

Symptoms:
  • Brown, slimy roots
  • Musty smell
  • Wilting leaves despite wet roots
Causes:
  • Reservoir temperature too high (>24°C)
  • Low dissolved oxygen
Solutions:
  • Use a water chiller
  • Add air stones to reservoir
  • Apply beneficial bacteria or hydrogen peroxide

Powdery Mildew

Symptoms:
  • White powdery spots on leaves
  • Leaf yellowing
Causes:
  • High humidity
  • Poor airflow
Solutions:
  • Increase air circulation
  • Lower humidity
  • Apply neem oil or potassium bicarbonate spray

Harvesting Guide

When to Harvest

Harvest when fruits reach the desired size for the specific variety (usually 15-30cm) and are firm to the touch. Do not let them yellow or get too large.

How to Harvest

Cut the stem with sterile shears or a knife about 1cm above the fruit. Do not pull the fruit off, as this can damage the fragile vines.

Storage Tips

Store in the refrigerator crisper drawer wrapped in plastic to retain moisture. They last 1-2 weeks.

Expected Yield

High; a healthy plant can produce 15-20+ fruits over its lifecycle.

Photo Gallery

Cucumber - Image 1
Cucumber - Image 2
Cucumber - Image 3

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