Categories: Garden

Grow Onions with Kitchen Scraps: Bottle Garden Goldmine


Discover an eco-friendly and resourceful way to cultivate onions using recycled plastic bottles and kitchen scraps. This guide presents a straightforward method that turns discarded materials into a thriving onion haven.

What You’ll Need

  • Recycled plastic bottles (cut in half)
  • Red onion bulbs
  • Compost or potting mix
  • Drill or sharp knife
  • Kitchen scraps (fruit and vegetable remnants)
  • Blender or chopping board
  • Spray or pulverizer bottle
  • Watering can or hose

Step-by-Step Guide

  1. Prepare the Plastic Bottles: Puncture drainage holes in the halved plastic bottles to avoid waterlogging.
  2. Fill with Nourishment: Load bottles with quality compost or well-aerated potting mix for optimal growth.
  3. Prep the Onion Bulbs: Trim the tops of red onions, leaving a small portion intact for new growth.
  4. Planting Time: Place prepared onion bulbs in bottles, ensuring the cut tops face upward.

Crafting Kitchen Waste Fertilizer

  1. Gather and Process: Collect kitchen scraps and finely process them for efficient decomposition.
  2. Fermentation Process: Allow the scraps to ferment in water to create a nutrient-rich fertilizer.
  3. Refine and Dilute: Filter the fermented blend and dilute it with water for application.

Applying the Fertilizer

  1. Preparation: Transfer the diluted fertilizer to a spray or pulverizer bottle for easy use.
  2. Application: Spray the soil around onion plants every two weeks for a nutrient boost.

Additional Care Tips

  • Watering Routine: Maintain soil moisture without overwatering.
  • Light and Care: Position bottles in a sunny spot for optimal growth.
  • Weed Control: Remove weeds to avoid nutrient competition.

Harvesting Time

  • Indicators: Harvest onions when green tops begin to yellow and bend.
  • Harvest Method: Gently pull onions from the soil and let them dry before storage.


Growing onions with recycled plastic bottles and kitchen scraps is a sustainable and rewarding endeavor. Follow these steps to nurture your own batch of homegrown onions while contributing to a greener lifestyle. Experiment with different kitchen waste blends to find the perfect fertilizer mix for your onion sanctuary. Happy gardening!

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