Bunching onions (Allium fistulosum), often called scallions or green onions, are the perfect crop for beginners with limited space. Unlike bulb onions that require long seasons and specific day-lengths, these versatile greens grow quickly, tolerate various climates, and can be harvested in as little as 60 days. You will learn how to transition from supermarket bundles to your own perpetual supply.
Getting Started with Seeds
Unlike bulb onions, bunching onions do not form large bulbs. They grow straight and slender, making them ideal for tight spaces like window boxes, pots, or garden borders. For best results, sow seeds directly into loose, well-draining soil once ground temperatures reach at least 45°F. Space seeds about 1 inch apart in rows 6 inches wide to encourage straight stalks.
Optimal Conditions
Most varieties thrive in full sun but appreciate light afternoon shade in USDA zones 8–10, where temperatures often exceed 85°F. Consistent moisture is the secret to tender stalks; keep the soil evenly damp but not waterlogged. Because they have shallow roots, they don't compete well with weeds, so keep your planting area clear of debris.
For a continuous supply, sow a new short row every three weeks throughout the growing season instead of planting all your seeds at once.
Harvesting for Growth
You can harvest these crops two ways. The "pull-and-replace" method involves pulling the entire plant once the stalk is about as thick as a pencil. Alternatively, use the cut-and-come-again technique: trim the green tops for use in the kitchen, leaving at least 2 inches of the white base in the ground. With enough light and water, the plant will push out new growth from the center, allowing you to harvest from the same base multiple times.
Container Success
If you lack garden soil, use a container at least 6 inches deep. Fill it with high-quality potting mix and ensure it has adequate drainage holes. Because pots dry out faster than the ground, check the moisture daily by sticking your finger into the soil. If it feels dry up to your first knuckle, it is time to water.
Start your first batch of seeds this weekend and enjoy a fresh, crisp harvest in just a few short weeks.