I decided to invest in some porous piping this year, as I spent many an evening last summer still watering with a hose as it was getting dark. Time just seemed to run out after returning from work and tending to the tunnel. The last thing I felt like after a long day at Heligan was coming home and watering for what felt like hours! I did try a sprinker device that was supposed to throw the water a long distance, but my water pressure is pretty low and it wasn't very effective. I therefore ordered 50m of porous piping from LBS Horticulture and have cut it to size so that four beds in the tunnel have piping running down the centre. It seems to be very effective, giving the ground a deep soaking, without battering leaves and foliage.