Growing Onions:

A Complete Guide from Sets to Harvest

Onions are a versatile and essential vegetable in many kitchens, adding flavor and aroma to a wide range of dishes. Whether you prefer sweet, mild onions or bold, pungent varieties, growing your own onions at home allows you to enjoy fresh, flavorful bulbs straight from the garden. In this guide, explore the step-by-step process of growing and caring for onions from onion sets to harvest, along with valuable tips and tricks to help you cultivate a successful crop.

Choosing Onion Sets

Onion sets are small, dormant bulbs that are commonly used to grow onions. When selecting sets, you want to choose firm, disease-free bulbs that are free from signs of damage or decay. Look for sets that are uniform in size and shape, as this can help ensure consistent growth and development.

Preparing the Soil

Onions thrive in well-drained and loose, fertile soil with a pH level between 6.0 and 7.0. Before planting, amend the soil with organic matter such as compost or aged manure to improve its texture and fertility. Avoid compacted or waterlogged soils, as these can inhibit root development and lead to poor bulb formation.

Planting Onion Sets

Plant onion sets in early spring, as soon as the soil can be worked and temperatures begin to warm. Space sets 4-6 inches apart in rows spaced 12-18 inches apart, with the pointed end facing upward. Plant sets at a depth of 1 inch, covering them lightly with soil. Avoid planting sets too deeply, as this can hinder bulb formation.

Companion Plants

Onions have several companion plants that can benefit them by either deterring pests, enhancing growth, or improving flavor when planted together. Some of these are listed below. 

• Lettuce: Lettuce makes a good companion for onions as it grows quickly and can fill in the space between onion rows, helping to suppress weeds.
  
  
• Carrots: Carrots and onions make a classic companion planting pair. They both repel each other's pests; onions deter carrot flies, while carrots deter onion flies.
  
  
• Beets: Beets can help repel onion pests like onion flies and can also benefit from the space provided by onions.
  
  
• Lavender: Lavender can repel pests like moths and fleas that might bother onions.
  
  
• Chamomile: Chamomile can improve the flavor of onions and also attract beneficial insects like hoverflies.
  
  
• Tomatoes: Some gardeners believe that planting tomatoes near onions can improve the flavor of both plants. However, others advise against it due to possible competition for nutrients.

Enemy Plants

Companion planting is not an exact science, and individual garden conditions may vary, so it's always a good idea to experiment and see what works best in your garden. However, some plants should be avoided when planning what to plant near your onions, like:

• Beans and Peas: Onions don't typically thrive when planted near beans and peas because they prefer different soil conditions and have different nutrient requirements. Beans and peas can also inhibit the growth of onions.
  
  
• Asparagus: Asparagus competes with onions for nutrients and space, so it's best to avoid planting them together.
  
  
• Sage: Sage can hinder the growth of onions, so it's not recommended to plant them together.
  
  
• Alliums: While some alliums like garlic and chives might seem like logical companions, they can compete for nutrients and space. Additionally, planting onions near garlic can increase the risk of disease spread.

Providing Adequate Water 

Onions require consistent moisture throughout the growing season to ensure proper bulb development. Water the plants deeply but infrequently, allowing the soil to dry out slightly between waterings. Avoid overwatering, as this can lead to root rot and fungal issues. When watering, directly water the root zone and try to avoid getting water on the foliage.

Mulching

Applying a layer of organic mulch such as straw, shredded leaves, or grass clippings around onion plants helps conserve soil moisture, suppress weeds, and maintain a uniform soil temperature. Mulching also protects the shallow roots of the onions from temperature fluctuations and soil erosion. Apply mulch after planting, taking care not to bury the emerging shoots.

Fertilizing

Onions are moderate feeders that benefit from a balanced fertilizer application at planting time. Incorporate a slow-release fertilizer into the soil or apply a liquid fertilizer according to package instructions. Avoid high-nitrogen fertilizers, as they can promote excessive foliage growth at the expense of bulb formation.

Weed Control

Keep the area around onion plants free of weeds, which compete with the onions for nutrients, water, and sunlight. Hand-pull weeds regularly, taking care not to disturb the shallow roots of the onions. Mulching can also help suppress weed growth and reduce the need for manual weeding.

Thinning

Once onion plants have become established and begun to grow, thin them to the appropriate spacing to allow room for bulb development. Thin plants to 4-6 inches apart, removing the smallest or weakest plants from each cluster. Thinning encourages larger bulbs and improves air circulation around the remaining plants, reducing the risk of disease.

Pest and Disease Management

While onions are relatively pest and disease resistant, they can still be susceptible to issues such as onion thrips, onion maggots, and fungal diseases like downy mildew and botrytis neck rot. Monitor plants regularly for signs of pest damage or disease and take prompt action to control infestations using organic methods such as insecticidal soap, neem oil, or beneficial insects.

Harvesting

Onions are typically ready for harvest 90-120 days after planting, depending on the variety and growing conditions. Harvest onions when the tops have turned yellow and begun to flop over, indicating that the bulbs have reached maturity. Carefully loosen the soil around the bulbs with a garden fork, then lift the bulbs from the soil and allow them to cure in a warm, dry location for 1-2 weeks before storing.

Longterm Storage

To store homegrown onions, you first need to dry them out completely. To store individually, place onions in net bags and hang them in a cool, dry, well-ventilated space like a cellar or garage, checking periodically for any that are deteriorating and discarding any that are. If you have harvested a glut, you can do dry them by spreading all of the onions out on a rack or on newspaper in a well-ventilated area for a couple of weeks until they have papery skins and shriveled leaves. Discard any damp onions. Trim the roots and remove loose skin, then cut the stems to the neck of the bulb. Or alternatively you can leave 2-3 inches of stem in order to string the onions. Homes and Gardens discusses how to string your onions in this article.

(Image credit: Getty Images)

Conclusion

Growing and caring for onions from sets to harvest may require some patience and attention to detail, but the rewards are well worth it. With proper preparation, planting, and maintenance, you can enjoy a bountiful harvest of flavorful onions straight from your own garden. Whether you prefer sweet, mild onions or bold, pungent varieties, there's nothing quite like the satisfaction of growing your own food and savoring the fruits of your labor in every bite.

Cultivating Sweet Potatoes:
From Slips to Harvest

Sweet potatoes are not only a versatile and nutritious vegetable but also a pleasure to grow in your own backyard. Whether you're a novice gardener or an experienced cultivator, the process of nurturing sweet potatoes from slips to harvest can be both rewarding and satisfying. In this comprehensive guide, we'll walk you through each step of the journey, offering valuable tips and tricks along the way to ensure a successful harvest of delicious sweet potatoes.

Understanding Slips

Unlike traditional seedlings, sweet potatoes are typically grown from "slips," which are young shoots that sprout from the eyes or nodes of a mature sweet potato. These slips can be purchased from garden centers or propagated at home by suspending a sweet potato in water until it produces roots and shoots. Once the slips reach a height of 6-8 inches, they are ready for planting. This video is great at explaining the process of how to produce sweet potato slips. 

Preparing the Soil

Sweet potatoes thrive in loose, well-drained soil with a pH level between 5.8 and 6.2. Before planting, amend the soil with organic matter such as compost or aged manure to improve its texture and fertility. Avoid heavy clay soils that can hinder root development and cause poor drainage, which can lead to rotting.

Planting Slips

Plant sweet potato slips outdoors after the danger of frost has passed and the soil has warmed to at least 16°C or 60°F. Choose a sunny location with ample space for the vines to spread. Dig a trench or mound the soil into hills to improve drainage and create a raised planting bed. Space the slips 12-18 inches apart, with rows spaced 3 feet apart.

Providing Adequate Water

Sweet potatoes require consistent moisture throughout the growing season, especially during the initial stages of establishment. Water the plants regularly, keeping the soil evenly moist but not waterlogged. A drip irrigation system or soaker hose can help deliver water directly to the root zone while minimizing moisture on the foliage, which can promote disease.

Applying Mulch

Applying a layer of organic mulch such as straw, shredded leaves, or grass clippings around sweet potato plants helps conserve soil moisture, suppress weeds, and maintain a uniform soil temperature. Mulching also reduces soil splashing, which can spread soil-borne diseases. Apply mulch after planting, taking care not to cover the stems of the slips.

Fertilizer

Sweet potatoes are moderate feeders that benefit from a balanced fertilizer application at planting time. Incorporate a slow-release fertilizer into the soil or apply a balanced organic fertilizer according to package instructions. Avoid high-nitrogen fertilizers, as they can promote excessive foliage growth at the expense of tuber development.

Weed Control

Keep the area around sweet potato plants free of weeds, which compete with the vines for nutrients, water, and sunlight. Hand-pull weeds regularly, taking care not to disturb the shallow roots of the sweet potatoes. Mulching can also help suppress weed growth and reduce the need for manual weeding.

Managing Pests and Diseases

Sweet potatoes are relatively pest and disease resistant, but they can still be affected by certain issues such as sweet potato weevils, wireworms, and fungal diseases like Fusarium wilt and root rot. Monitor plants regularly for signs of pest damage or disease, and take prompt action to control infestations using organic methods such as neem oil, insecticidal soap, or beneficial nematodes.

Harvesting

Sweet potatoes are typically ready for harvest 90-120 days after planting, depending on the variety and growing conditions. To determine if sweet potatoes are ready for harvest, carefully dig around the base of the plants and inspect the tubers. Harvest sweet potatoes when they reach a desirable size and the skins have cured, typically after the first frost or when the vines begin to yellow and die back.

 

Curing and Storage

After harvesting, allow sweet potatoes to cure in a warm, well-ventilated area for 1-2 weeks to toughen the skins and improve flavor and storage life. Once cured, brush off any excess soil and store sweet potatoes in a cool, dark place with good air circulation, such as a cellar or pantry. Properly cured and stored sweet potatoes can last for several months.

Conclusion

Growing sweet potatoes from slips to harvest may require some patience and attention to detail, but the rewards are well worth it. With proper preparation, care, and maintenance, you can enjoy a bountiful harvest of delicious sweet potatoes that are perfect for roasting, baking, or mashing. Whether you're a beginner gardener or a seasoned pro, there's nothing quite like the satisfaction of growing your own food, especially when it's as tasty and nutritious as sweet potatoes.