Answer: It sounds as though you undermined the soil a bit when you pulled out a clump of weeds. The best remedy for the situation is to hold the fountain grass in the opposite direction of the lean, and fill in beneath the plant with some soil so it sits level again. Don't try to stake it upright, just fill in the hole. You may have to dig around a little to gain access to the root mass, but once you do, you can push some soil into the space and gently tamp it down. Then water thoroughly to help settle the soil.
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