You probably got the miscanthus from Powertools? Mine's shedding too. It's from a container I bought with various fruits (costs $55,000), and it doesn't shed.
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That one is the planting rhyzomes. It is used with a modified potato planter to plant myscanthus. The shedding is by harvesting the crop with a forage harvester (like chaff), so now I understand. Sorry for not specify this in description. Although I have no idea of what container you talk about. In store you can buy myscanthus for planting in wooden boxes.