How to Grow Onions

Onions are a staple in many kitchens and are relatively easy to grow in your garden. They can be grown from seeds, sets, or transplants. This guide will help you grow healthy onions in your garden.

What You’ll Need

  • Onion seeds, sets, or transplants
  • Well-draining soil
  • Compost
  • Watering can or hose

Choosing the Right Variety

Onions come in many varieties. Some popular types include:

  • Yellow Onions: Versatile and commonly used in cooking.
  • Red Onions: Mild flavor, great for salads and sandwiches.
  • White Onions: Sweet and crisp, often used in Mexican cuisine.

Preparing the Soil

Onions prefer well-drained, fertile soil with a pH of 6.0-7.0. Here�s how to prepare your soil:

  1. Loosen the Soil: Till the soil to a depth of 8-10 inches (20-25 cm). Remove any stones or debris that could impede root growth.
  2. Add Compost: Mix in 1-2 inches (2.5-5 cm) of compost to improve soil fertility and structure.

Planting Seeds, Sets, or Transplants

Onions can be grown from seeds, sets, or transplants. Here�s how:

  1. Seeds: Sow seeds 1/4 inch (0.6 cm) deep in rows spaced 12-18 inches (30-45 cm) apart. Thin seedlings to 4-6 inches (10-15 cm) apart once they have a few true leaves.
  2. Sets: Plant sets 1 inch (2.5 cm) deep and 4 inches (10 cm) apart in rows spaced 12-18 inches (30-45 cm) apart.
  3. Transplants: Transplant seedlings outdoors after hardening off, spacing them 4-6 inches (10-15 cm) apart in rows spaced 12-18 inches (30-45 cm) apart.

Watering and Care

Onions need consistent watering and care. Follow these tips:

  • Water Regularly: Keep the soil consistently moist, but not waterlogged. Water in the morning to reduce evaporation.
  • Mulch: Apply a 2-3 inch (5-7.5 cm) layer of mulch around the plants to retain moisture and suppress weeds.


Onions benefit from regular fertilization. Use a balanced fertilizer (10-10-10) every 3-4 weeks.


Onions are ready to harvest when the tops start to yellow and fall over. Here�s how to harvest:

  • Check Regularly: Harvest onions when the tops have fallen over and the bulbs are fully mature. Use a garden fork to lift the bulbs from the soil.

Storing Onions

Onions can be stored in several ways:

  • Curing: Allow onions to cure in a warm, dry, and well-ventilated place for 2-3 weeks. Store cured onions in a cool, dry place.
  • In the Fridge: Store fresh onions in a plastic bag in the refrigerator crisper drawer. Use within 1-2 weeks.

Tips and Tricks

  • Succession Planting: Sow seeds every 2-3 weeks for a continuous supply of fresh onions.
  • Companion Planting: Grow onions with carrots, lettuce, or tomatoes to maximize garden space.


Growing onions using these methods will help you achieve a bountiful harvest of delicious, homegrown onions. With proper care and attention, you can enjoy fresh onions from your garden all season long.

Leave a Comment

Your email address will not be published. Required fields are marked *