- Species and varieties: Mini onions, also known as pearl onions, belong to the species Allium cepa. They are small, round onions that come in white, red, and yellow varieties. These onions are typically about 1 inch in diameter and are known for their mild and sweet flavor.
- Hybrid or heirloom: Mini onion seeds can be found in both hybrid and heirloom varieties. Heirloom varieties are open-pollinated and have been passed down through generations, while hybrid varieties are bred for specific traits such as disease resistance and uniformity.
- Pruning and training: Mini onions do not require pruning or training. However, it is important to keep the area around the plants free of weeds to reduce competition for nutrients and water.
- Fertilization needs: Mini onions benefit from a balanced fertilizer applied at planting time. A fertilizer with a higher phosphorus content can help promote bulb development. Side-dressing with nitrogen fertilizer during the growing season can also be beneficial. Avoid over-fertilizing, as this can lead to excessive leaf growth at the expense of bulb formation.
- Hardiness zones: Mini onions can be grown in USDA hardiness zones 3-9. They are quite adaptable and can be grown in a variety of climates, but they prefer cooler weather.
- Climate requirements: Mini onions thrive in cool weather and should be planted in early spring or late summer. They require full sun and well-drained soil with a pH between 6.0 and 7.0. Consistent moisture is important, but the soil should not be waterlogged.