How many years do you have to wait tell you divide the lily bubs?
What's The Time Frame to Divide Lilies
Lilies will tell you when they need to be divided. When the blooms are cramped and can't open without running into each other, or the outer stems are laying down because there's just no room to go straight up. Any time you find the display less than appealling then by all means, go ahead and position them the way you like.