|Cotton grass, rushes and flag iris in the bog
Willows are the easiest of trees to grow from cuttings. Take a 300mm length of green willow anything from 10 - 25mm in diameter and stick it in the ground for about two thirds of its length. Stand back, because they grow rather quickly. I read somewhere once that medieval farmers in lowland England planted elm trees around field boundaries to improve drainage because the transpiration stream of the elm trees pumped water out of the ground. Perhaps the willows will do this too.