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Invasive water hyacinths are effective at removing microplastics, study finds
(news.mongabay.com)
In the new study, the vast majority of the microplastics were concentrated on the root caps of the plants, a protective structure on the tip of the plant’s roots. A smaller amount was observed in the roots themselves, and even less was found in the stem. No plastic was detected in the leaves.
Notably, removal by binding them, not dissolving them.
I don't get why you would then suggest farming the leaves only. The microplastics are still in the environment then.
Especially the burning example, wouldn't collecting the whole plant and burning the roots too remove the microplastics from the environment instead of only binding them?