The weeds mostly came up in the space between the prairie segments. Probably didn’t originate in the prairie itself, but weed seeds move easily.
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Here are some thoughts on this technique with regards to coarse substrate prairies by Illinois ecologist / founder of the Illinois Natural Areas Inventory John White (starting on page 5): https://www.naturalland.org/wp-content/uploads/2021/09/Bell_Bowl_Prairie_statements_by_John_White.pdf
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