Harris Seeds Onion Sets

Long-day onions are specifically bred to begin forming bulbs when daylight reaches 14 to 16 hours. They perform best in northern regions where summer days are longer, making them ideal for gardeners in those climates.

Plant the sets with the pointed end facing up, burying them about 1 to 2 inches deep. Ensure the soil is loose and well-drained to allow the bulbs enough room to expand as they grow.

The onions are ready for harvest in late summer once the green tops begin to yellow and naturally fall over. At this stage, the bulbs have reached their full size and are ready to be pulled from the soil.

Yes, Red Karmen onions can be grown in containers as long as the pot is at least 8 to 10 inches deep and has adequate drainage holes. Ensure the container is placed in a location that receives full, direct sunlight throughout the day.

Onions thrive in fertile, well-drained soil with a slightly acidic pH. Before planting, mix in organic matter like compost to improve soil structure and nutrient content, which helps support the development of 2 to 3-inch bulbs.