Onions are a versatile and essential vegetable in kitchens worldwide. While most gardeners may be familiar with growing onions from sets or transplants, starting onions from seeds offers a rewarding and economical way to grow a wide variety of onions.

1. Why Grow Onions from Seeds?

Growing onions from seeds has several advantages over using sets (small bulbs) or transplants. First, seeds offer a much wider variety of onion types, from sweet and mild onions to strong, pungent ones. Many heirloom and hybrid varieties that aren’t available as sets can be easily grown from seeds. Additionally, growing from seeds tends to result in healthier plants with larger, better-formed bulbs because they develop strong root systems from an early stage.

Another benefit is cost. A single packet of Onion Seeds contains hundreds of seeds and is far more economical than purchasing sets or transplants. Lastly, onions grown from seeds are less likely to bolt (produce flowers prematurely), a common issue with sets. Bolting can reduce the size and quality of onion bulbs, so starting from seed can lead to a better yield.

2. Types of Onion Seeds

Onion seeds are generally classified based on the daylight hours required to initiate bulb formation. There are three primary types of onions: short-day, intermediate-day, and long-day onions. Choosing the right type of onion seed for your location is essential for a successful harvest.

·         Short-Day Onion Seeds: These onions need about 10-12 hours of daylight to form bulbs and are best suited for southern regions with mild winters. Short-day onions are usually planted in the fall and harvested in late spring. Popular varieties include Texas Grano, Red Creole, and White Bermuda. These onions are often sweet and store well.

·         Intermediate-Day Onion Seeds: Requiring 12-14 hours of daylight, intermediate-day onions are versatile and can be grown in both southern and northern climates. Varieties such as Candy and Super Star are popular choices for their mild flavor and medium storage life. These onions are typically planted in early spring and harvested in late summer.

·         Long-Day Onion Seeds: Long-day onions need 14-16 hours of daylight to form bulbs, making them ideal for northern regions where summer days are long. Popular varieties include Walla Walla, Yellow Sweet Spanish, and Redwing. Long-day onions tend to have a stronger flavor and a longer shelf life compared to short-day varieties. They are planted in early spring and harvested in late summer or early fall.

3. Planting Onion Seeds

Growing onions from seeds takes a bit more time and effort than using sets, but the results are well worth it. Follow these steps for a successful onion crop.

·         Start Indoors: Onion seeds should be started indoors about 8-12 weeks before the last expected frost date. Sow the seeds in seed trays or pots filled with a seed-starting mix. Plant the seeds about 1/4 inch deep and keep the soil consistently moist. Onions need warmth to germinate, so place the trays in a warm, sunny location or use a heat mat to encourage germination. The seeds should sprout within 7-10 days.

·         Transplanting: Once the onion seedlings have grown 4-6 inches tall and the outdoor temperature has warmed, they can be transplanted into the garden. Choose a sunny location with well-drained, nutrient-rich soil. Onions are heavy feeders, so it’s a good idea to work compost or organic matter into the soil before planting.

Space the seedlings 4-6 inches apart in rows that are 12-18 inches apart. This spacing allows for proper air circulation and enough room for the bulbs to develop. Be gentle when transplanting to avoid damaging the seedlings’ delicate roots.

4. Caring for Onion Plants

Onions require consistent care throughout their growing season to ensure a successful harvest. Here are some important factors to consider:

·         Watering: Onions have shallow roots and need regular watering, especially during dry periods. Aim to provide about 1 inch of water per week. However, be careful not to overwater, as onions are susceptible to root rot if the soil becomes waterlogged. Mulching around the plants can help retain moisture and reduce the growth of weeds.

·         Fertilization: Onions are nutrient-hungry plants. During the growing season, it’s essential to fertilize regularly with a balanced fertilizer or one high in nitrogen. Nitrogen promotes healthy leaf growth, which in turn helps the onion bulbs develop. Apply fertilizer every 2-3 weeks until the bulbs start forming.

·         Weeding: Onions do not compete well with weeds due to their shallow root systems. Regular weeding is necessary to prevent weeds from stealing nutrients and water. Be careful when weeding to avoid disturbing the onion plants. Mulching can help minimize weed growth.

·         Pest Control: Onions are relatively hardy and resistant to many pests, but they can be affected by onion maggots, thrips, and fungal diseases. To reduce the risk of pests, practice crop rotation and avoid planting onions in the same spot year after year. If pests become a problem, consider using organic insecticides or companion planting with pest-repellent plants like garlic or marigolds.

Get More Insights on Onion Seeds

Missing comfort of reading report in your local language? Find your preferred language :