It seems that someone may be using your thread as a test bed SallyD, you see I am a citizen of the United States with an interest in growing more cacti and I am not certain where exactly to start here. I suppose Carnegias means Carnegia Gigantes which means Giant Saguaro here in the states, I do not live where they grow naturally but I would like to see more grown. From what I gather you have a tray of seedlings that could eventually grow very tall, that is all for now.