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GARDENING RESOURCES

Growing Onions


GARDENING FACT SHEET:

Click to View Printable PDF file: “Growing Onions”


When to Plant Onions

  • Plant onion sets in the spring, usually mid to late April.
  • Onions can take a frost, but will not tolerate a hard freeze. Mulching your bed will help keep the soil warm.

Where to Plant Onions

  • Onions require a sunny location; ideally at least 8 hours of sun a day.

Soil Preparation, Fertilizer and Mulch for Onion Plants

  • Prepare the soil by working some aged compost and an all-purpose fertilizer into your soil to a depth of at least 4-6 inches.
  • Onion bulbs will not be able to grow in compacted soil.
  • Onion sets should be planted no deeper than 1 inch below the soil line, 3-4 inches apart.
  • Onions prefer moist, but not soggy, soil.
  • Onions are shallow rooted, so will benefit greatly from a 1-2 inch layer of mulch.
  • Onions are heavy feeders so side-dress with an all-purpose fertilizer once a month.

Harvesting and Storing Onions

  • Onions are ready to harvest when their leaves are starting to turn brown, or the tops are falling over; usually mid to late August.
  • Stop watering several days before harvest to allow the soil to dry out.
  • Dig up the onions, and let them cure in a warm, ventilated area for about 2 weeks.
  • Once the stems have fully dried, cut them off about an inch above the onion and move the onions to a cool, dark area for storage.

 

Click to View Printable PDF file: “Growing Onions”

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McCord's Garden Center

McCord’s Garden Center and Landscaping is a locally-owned and operated family business located in Monument, CO. We provide year round landscaping design and installation services. Our Garden Center is open seasonally. www.McCordGardens.com

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