Hello all! I'm fairly new to gardening still and have some probably stupid questions to ask. I have planted asiatic lilies over the last three years and noticed this year that the more they spread the lower they grow. I'm guessing I need to split the bulbs but I was hoping to get some reassurance before I do it and possibly damage them. Do they need split? Every year? Are they easily damaged? When is the best time to split them? Any and all info would be greatly appreciated. Happy Gardening!