Categories: Garden

Growing Onions in Plastic Bottles with Kitchen Waste Fertilizer: A Simple and Sustainable Method

Embarking on a journey to grow your own onions is not only a rewarding experience but can also be eco-friendly and resourceful. In this guide, we will explore a simple yet effective method of growing onions in recycled plastic bottles using kitchen waste fertilizer. Additionally, we will delve into the details of creating a nutritious kitchen waste fertilizer to support the growth of your onion garden.

Materials Needed:

  1. Plastic bottles (half-cut)
  2. Red onion bulbs
  3. Compost or potting mix
  4. Drill or sharp knife
  5. Kitchen waste (fruit and vegetable scraps)
  6. Blender or chopping board
  7. Spray or pulverize bottle
  8. Watering can or hose

Steps to Grow Onions in Plastic Bottles:

  1. Prepare the Plastic Bottles:
    • Take half-cut plastic bottles and make several drainage holes at the bottom. Adequate drainage is crucial to prevent waterlogging.
  2. Fill with Compost:
    • Fill each plastic bottle with high-quality compost or a well-balanced potting mix. The soil should be loose and well-aerated.
  3. Prepare Onion Bulbs:
    • Cut the top of each red onion, leaving a small portion intact. This encourages new growth from the center of the onion.
  4. Plant the Onions:
    • Place one prepared red onion bulb in each plastic bottle, ensuring that the cut top is facing upward. Press the onion gently into the soil.
  5. Make Kitchen Waste Fertilizer:
    • Collect kitchen waste such as fruit and vegetable scraps, coffee grounds, and eggshells. Avoid using meat or dairy products, as they may attract pests.
    • Chop or blend the kitchen waste into small pieces for efficient decomposition.
    • Place the processed kitchen waste in a container and add water to cover the scraps. Let this mixture ferment for a few days, stirring occasionally.
  6. Strain and Dilute the Fertilizer:
    • After fermentation, strain the kitchen waste mixture to obtain a liquid fertilizer.
    • Dilute the liquid fertilizer with water in a 1:3 ratio (one part fertilizer to three parts water). This ensures that the fertilizer is not too concentrated.
  7. Apply Kitchen Waste Fertilizer:
    • Transfer the diluted kitchen waste fertilizer into a spray or pulverize bottle.
    • Apply the fertilizer to the soil around the onion plants. This should be done every two weeks to provide a consistent source of nutrients.
  8. Watering:
    • Maintain the soil’s moisture by watering the onions regularly. Avoid overwatering, as this can lead to root rot.
  9. Sunlight and Care:
    • Place the plastic bottles in a location that receives ample sunlight, ideally 6-8 hours per day.
    • Monitor the growth of the onions, and remove any weeds to prevent competition for nutrients.
  10. Harvesting:
    • Harvest the onions when the green tops start to yellow and fall over. Gently pull the onions from the soil and allow them to dry before storage.


Growing onions in plastic bottles with kitchen waste fertilizer is a straightforward and sustainable method that allows you to repurpose materials and reduce kitchen waste. By following these detailed steps, you can cultivate healthy, homegrown onions while contributing to a more eco-friendly lifestyle. Experiment with different kitchen waste combinations to find the best fertilizer mix for your onion garden. Happy gardening!

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