Looking to add tiger lilies to your garden? Well an easy way to is to find a friend who has tiger lilies and is willing to give you some of the stem bulbils. Bulbils are usually mature in fall. If you can see roots starting to form at the bottom of the bulbils then they can be harvested. In Wisconsin you can take them right off the plant and plant them into the ground (about an inch or so). You can also put them in a paper bag and place them in the refrigerator for about a month. Then you can start them inside for spring planting. The plants I have started from bulbils usually take about 3 years before they actually produce a flower.