What Is Happening With These Allium?

Question

I have grown these alliums from seed. Last year they had no flowers, just chive like leaves. This year the same leaves have developed little brown, slightly fluffy ‘flower-like’ growths.

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Answer 1

It looks like yellow nut sedge, an aggressive weed. Here is more:

https://www.gardeningknowhow.com/plant-problems/weeds/yellow-nutsedge-control.htm