Onions

Onions

August 29, 2024

Introduction

Onions are relatively easy to grow, making them fun for beginners and New Yorkers (are you both?). You'll need an outdoor spot that gets at least six hours of sun and a container at least 12 inches deep. Might I suggest a trip to your local second hand store? Get creative, New Yorkers!

The What

Onions, scientifically known as Allium cepa, belong to the Allium family, which includes garlic, leeks, and chives. These versatile vegetables are essential in numerous recipes, bringing rich flavor and nutrition to your meals. Onions are biennial plants, typically grown as annuals, meaning they complete their life cycle in one year. They are rich in vitamins C and B6, folate (a type of B vitamin), and antioxidants. Onions can be grown from seeds, sets (small immature bulbs), or transplants, thriving in well-draining soil and ample sunlight. Adding onions to your urban garden will elevate your cooking and health​.

The Why

Urban dwellers in NYC will find growing onions a delightful. These hardy vegetables thrive in containers, ideal for balconies, rooftops, or terraces. Onions are low-maintenance and pair well with other crops like arugula, carrots, and lettuce, increasing the productivity of small gardens. Freshly harvested onions have superior flavor and nutritional benefits compared to store-bought varieties. For those in zone 7b, onions are a sustainable option because it reduces your carbon footprint. It's a small step towards a more flavorful and health-conscious lifestyle.

Sunlight Requirements

Onions require 6-8 hours of direct sunlight daily. Indoors: they need a lot of light, ideally 12-16 hours of a grow light daily.

Water Requirements

Water regularly to keep soil evenly moist. Indoors, air can dry soil quickly; outdoors, water regularly, especially during hot weather. Mulching helps retain moisture.

Temperature Tolerance

Onions are a cool weather crop and thrive in 55-75°F, ideally 60-70°F. Plant outdoors in March-May and August-September in NYC zone 7b. Cooler temperatures prevent bolting and ensure large bulbs.

Container Size

Indoors: 6-8" wide, 6" deep, 1 gallon; Outdoors: 10-12" wide, 12" deep, 3-5 gallons

Best Soil Mix

Onions prefer well-draining potting mix with organic matter, such as organic compost or worm castings. Indoors, stick to worm castings.

How to Add Fertilizer

Apply balanced fertilizer 10-10-10 every 3-4 weeks. Organic options: compost, bone meal, blood meal. Higher potassium levels during bulb formation support optimal growth.

Growth Duration

Onions are ready for harvest 100-120 days after planting, or when the tops fall over and dry out. Indoors, onions tend to live 4 to 6 months. Outdoors, onions can live for 1 to 2 years if left unharvested.

How To Trim

Remove yellowing leaves to encourage healthy growth. Regular monitoring ensures a good yield of flavorful onions.

Growing Challenges

Yellow Leaves: Ensure good drainage, moderate watering. Slow Growth: Use balanced fertilizer. Pests (Onion Maggots): Rotate crops seasonally. Wilting: Water consistently. Diseases (Downy Mildew): Improve air circulation.

Interesting Facts

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Blog
Onions

Onions

Onions are relatively easy to grow, making them fun for beginners and New Yorkers (are you both?). You'll need an outdoor spot that gets at least six hours of sun and a container at least 12 inches deep. Might I suggest a trip to your local second hand store? Get creative, New Yorkers!

Onions

Here are the essential Onions basics you need.

Sunlight Requirements

Onions require 6-8 hours of direct sunlight daily. Indoors: they need a lot of light, ideally 12-16 hours of a grow light daily.

Water Requirements

Water regularly to keep soil evenly moist. Indoors, air can dry soil quickly; outdoors, water regularly, especially during hot weather. Mulching helps retain moisture.

Temperature Tolerance

Onions are a cool weather crop and thrive in 55-75°F, ideally 60-70°F. Plant outdoors in March-May and August-September in NYC zone 7b. Cooler temperatures prevent bolting and ensure large bulbs.

Container Size

Indoors: 6-8" wide, 6" deep, 1 gallon; Outdoors: 10-12" wide, 12" deep, 3-5 gallons

Best Soil Mix

Onions prefer well-draining potting mix with organic matter, such as organic compost or worm castings. Indoors, stick to worm castings.

Fertilizing

Apply balanced fertilizer 10-10-10 every 3-4 weeks. Organic options: compost, bone meal, blood meal. Higher potassium levels during bulb formation support optimal growth.

Growth Duration

Onions are ready for harvest 100-120 days after planting, or when the tops fall over and dry out. Indoors, onions tend to live 4 to 6 months. Outdoors, onions can live for 1 to 2 years if left unharvested.

How To Trim

Remove yellowing leaves to encourage healthy growth. Regular monitoring ensures a good yield of flavorful onions.

Growing Challenges

Yellow Leaves: Ensure good drainage, moderate watering. Slow Growth: Use balanced fertilizer. Pests (Onion Maggots): Rotate crops seasonally. Wilting: Water consistently. Diseases (Downy Mildew): Improve air circulation.

The Many Varieties of Onions

There are around 10-15 varieties of arugula gardeners commonly grow. One of the perks of growing arugula at home is the opportunity to experiment with different varieties that you won't find at the grocery store.

You can get a variety pack with 8 types of basil here.

Do you have any questions or requests? I'm here to help!

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