This started out protecting strawberries from blackbirds, but I have also found it very effective against the pigeons that go for my broccoli and cabbages.
The basic design is a pole hung on a string that revolves in the wind but it has been refined and developed over the years. Start by building two supports with a beam between them for the pole to hang on.
I usually use a “wigwam” of three, six foot, bamboos each end and a 2.4 meter piece of batten between them because it is about the right length for my beds and lightweight but reasonably strong, especially if stood on edge. The essentials are that the ends should be stable enough and the beam strong enough to support the pole if the wind gets up.
In order to make the pole revolve I use tin foil take away containers facing in opposite directions on each end of the pole. These have the added advantage of being shiny and reflecting light as they move round, birds don’t like that. When I first started out I would fasten these on with gaffer tape, but I have since found that it is far more effective to use a staple gun. I position the take away container so that the flange and the side of it butt onto two sides of the piece of batten I use for a pole. I used to use a bamboo but abandoned that when I started using staples, it requires at least four of them well spaced to prevent the foil from tearing. Sandwiching the foil between the beam and a piece of plastic cut from the body of the milk bottle is a refinement that also helps prevent this.
The first problem that I encountered was that the string would twist itself into a knot as the beam revolved continually in the same direction, At first I thought it might unwind when the wind dropped, but this is not the reality. To counter this I cut a short section from the tubular handle of a plastic milk bottle and pierced it with a hot barbecue skewer. I then fed a piece of string in through each side and drew them out through the open end of the tube, put a large knot in each and pulled them back in again, one piece attaches to the beam, the other to the pole and the tube in the centre acts as a swivel. This works much better with the heavier batten pole than it did with the lightweight bamboo.
When setting up the pole you can either attach the string dead centre, put on the tin foil containers and then balance it out by attaching weights or attach the containers and then find the centre of balance and attach the string there. Either way ensure that the pole has plenty of clearance to revolve without hitting obstacles and remember it may be longer one end if you worked by the centre of balance. It also pays to keep the strings relatively short, partly because the pole does not sway so much, partly because by the time the supporting bamboos are splayed your beam will only be about five feet from the ground, the pole and containers will take up about nine inches of that, allow another eighteen inches for the strings and swivel and that leaves a little under three foot for your crop to grow in.
When attaching the strings to the beam and pole I find it pays to make a large knot in the string and then attach it with the staple gun, this stops it slipping away from the centre. The longer the pole the more leverage, 2metre poles revolve in the lightest of airs. If units are positioned next to each other it is possible to adjust things so that the container on one side occasionally strikes the pole on the other when they coincide, this makes a very good bird scaring noise, but is a bit superfluous.



LinkBack URL
About LinkBacks

Reply With Quote



Bookmarks