Bitterns will use reed which is cut every one to three years. It may be possible to leave patches on a longer rotation if labour is available for noncommercial purposes, although the size and number needed have not been investigated. Reedbed rehabilitation Seriously dried-out reedbed can be dug out if it does not already have any conservation interest, eg for invertebrates. This is drastic and expensive but sets back succession for considerable periods. Deeper pools could be dug which take decades to re-colonise, but supply encroaching reed edge over a long period.
Bitterns feed mostly near natural reed edge, especially if water levels are low in the reedbed.
These edges provide suitable access to fish and amphibians. Manage growth within dykes bi-annually on rotation, by mowing and raking, to keep dykes open and allow an increase in fish numbers. Great care must be taken in disposal of dredgings to prevent raising and subsequent drying-out of areas next to dykes. Ideally remove the spoil from the site but otherwise put in a flattened heap on one side away from the edge as an access ride. Avoid creation of a spoil 'lip' which prevents fish entering the reedbed and may block foot drains.