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Another contender
Oxalis, specifically the invasive one.
>bulb has bulbs which have bulbs
>can't pull it out without spreading bulbs everywhere
>can't compost the bulbs
>bulbs you pulled out by accident contaminate your compost
>bulbs everywhere
>contaminates mulch and potting mix
The plant itself doesn't really do anything bad, which somehow makes it even more niggardly.
The real issue is scale, the larger scale you work on the more of a problem these will be.
