Answer: As you might have guessed, it will be difficult to eliminate horsetail. The plant has deep roots and spreads by underground rhizomes. Try to improve drainage--horsetail likes moisture. Keep the area mowed if possible. If you are growing a crop plant, keep the area properly fertilized to help the crop compete with the weeds. One source suggests planting a cover crop of nasturtiums--horsetail cannot endure shading and will be smothered by the dense foliage..
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