The root systems of most flowing perennials either become too crowded, which results in loss in vigor, and spread too far outward, producing a bare center.
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Awhich results in loss in vigor, and spread
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Bresulting in loss in vigor, or spreading
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Cwith the result of loss of vigor, or spreading
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Dresulting in loss of vigor, or spread
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Ewith a resulting loss of vigor, and spread
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