Literally. Step on them and knock them down. By doing so it breaks the top shoot it keeps the energy in the bulb. The little roots now only have to feed the big root, the bulb itself. Over time they will grow larger than if left vertical. This should be done once you notice the seed head has formed. First you cut it off, then you walk ‘em down!
Although, I must admit, they do look pretty sad just lying there.
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