[jk]

Thanks for information about watering method. One idea to reduce size of raindrops, although it would be a lot of work, is to raise the center posts and make the center ridge of the shade cloth higher so that the view from the front is an upsidedown "V". I don't know what kind of angle it would have to be to get most of the rain to run down the shade cloth, but you can get some idea by experimenting with the extra shade cloth that's hanging down at the back. However, it's probably a lot easier to germinate the sundew seeds outside the shade house.