What characteristic of onion grass makes its manual removal labor-intensive and frustrating for lawn uniformity?
It spreads via small, separable bulbs that detach easily when pulled.
The core challenge in physically eradicating onion grass stems directly from its subterranean structure. The plant does not rely solely on deep taproots or surface runners; instead, it regenerates from numerous small, separable bulbs clustered beneath the soil. When a gardener attempts manual removal by digging or pulling a clump, these miniature storage organs frequently detach and scatter into the surrounding soil. Because each detached bulb functions as the foundation for a new, independent plant, leaving even a few behind guarantees regeneration. Therefore, successful manual removal demands painstaking extraction of every single bulb.

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Edible Onion Grass / Crow Garlic / Field Garlic (Allium vineale)
What to Do With Wild Onions and Garlic in Your Lawn - YouTube