What a little stunner this is. A Dendrobium kingianum, but which one I don't know. I've had this plant for many years growing in a pot. I decided a couple of years ago to release all my orchids into the garden. This one I put on top of the soil between two large old logs which I then filled with leaf mulch. It's actually growing underneath one of the lovely pink blossom trees from a month back.
This year it really looks likes its appreciating my efforts on its behalf. This flower stem is completely out and there are probably another 4 or 5 stems to come - which should stretch the flowering season out enormously. I sprinkle a little cow manure on it occasionally and that's it.