The cactus seeds planted outdoors in seed starter trays are growing very well now. They are covered with 50% shade cloth and the sun heats them up very well. The growing medium has to stay fairly wet for cactus seedlings and if there is no rain they have to be sprayed with water every 2 to 3 days. The seedlings are starting to put out spines and only one out of more than 200 pots had to be disposed of because of mold. This outdoor method is turning out to be a great way to start cactus seedlings. There is no evidence of insect problems, only one instance of mold and more healthy seedlings than in any indoor trial, and I'm really happy with the way this method is developing.