Yeah that's not accurate at all.
The sedges will provide shade to the ground under the oak & slow runoff; this keeps the soil from drying out & helps the oak. But sedges definitely won't move water through the soil to help the oak.
The sedges will provide shade to the ground under the oak & slow runoff; this keeps the soil from drying out & helps the oak. But sedges definitely won't move water through the soil to help the oak.