Question
I have a large clump of lillies that I haven't touched in the 14 years we have been in our house. I would like to separate them out and make a row of them along the edge of my lawn. What is the best time of year or time in the growth process to do this? Thank you.

Answer
Hi Beth,
Thanx for your question.  You didn't say where you lived, so, I'm going to wing it.  Actually, the answer is pretty easy.  Tiger lilies perform best in temperate climates.  That means, if you live in the U.S., most of the country except the deep South, many parts of central and southern California, Puerto Rico, Hawaii and Guam.  This lily requires an extended cold period in order to bloom the next year.  That means it requires the four seasons most of the U.S. has.  The cold period (at least 90 days) allows the bulb to go dormant and "rest" for nest year's growth and bloom. If you want to separate your lilies, do so each 3 years.  You'll find an abundance of bulbs and bulblets.  The bulbs will bloom the next year, the bulblets, depending upon the size will result in blooming plants in 2-3 years.  There are also organisms called bulbils which are black and look like berries in the leaf axils (where the leaf meets the stem).  These bulbils can be planted and result in a new lily however, they probably won't bloom until year two.  I hope this helps.
Tom