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How Much Water Do Marijuana Plants Need?Updated 5 months ago


The amount of water cannabis plants require depends on several factors, including growing environment, pot size, substrate type, and plant growth stage.

Key Factors Affecting Water Needs

1. Plant Container Size

  • Pot size impacts moisture retention and drainage
  • Adjust watering frequency based on pot size:
    • Smaller pots: Water more frequently
    • Larger pots: Focus watering around the central stem

Tip: For nutrient feeding, ensure 10-20% runoff from the bottom of pots


2. Growing Media

Different substrates have varying water retention properties:

  • Coco coir may require more water than living soil
  • Understand your medium's characteristics for optimal watering

3. Temperature

  • Warmer conditions increase water loss
  • Indoor grows offer better temperature control
  • For outdoor grows, monitor weather conditions closely

4. Growth Stage

Watering needs change throughout the plant's life cycle:

Growth StageWatering Recommendation
SeedlingsLight misting several times daily
Young vegging plants1 gallon every 3-5 days
Late vegetative growth2 gallons every 3-5 days
FloweringGradually reduce amounts

Indoor vs. Outdoor Watering

  • Indoor: More control over environmental factors
  • Outdoor: Consider natural drainage, weather, and climate

Tips for Proper Watering

  1. Progressively transplant to larger pots as plants grow
  2. For oversized pots, focus watering around the central stem
  3. Adjust watering based on environmental conditions
  4. Keep detailed records of watering and plant responses
  5. Use common sense for outdoor grows (e.g., less watering after rainfall)

Remember, these are general guidelines. Always observe your plants and adjust watering practices based on their specific needs and environmental conditions.

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