When planting, each bulb should surrounded with a little sharp sand both under and above the bulb to keep slugs away and to ward off excessive wetness. As most liliums are stem rooting we strongly recommend you plant at 15cm deep. They give a much better display when planted in clumps of 3, 6 or 12 bulbs (45cm apart).
Cultural Instructions
Take some care to prevent slugs and snails from attacking the iris once planted. Most Dutch iris are only suitable for planting in the garden or in a cool greenhouse or a cold frame.