Question
QUESTION: Any clue why the leaves of my tiger lilies are yellowing?  The deer did a nice job on the flowers, but at least I had a section of green leafed plants.  Now, they are yellow/green--not so attractive.

ANSWER: Hi Cathy,
Thanx for your question.  My guess is that once the flowers are eaten, the plant will not rebloom if this is Lilium lancifolium or also known as L. tigrinum.  These lilies will not rebloom when the flowers are eaten or destroyed or have already bloomed.  Then the foliage will begin to degrade as it is gathering energy from the sun for next year's bloom and growth.  Don't cut the stalk down until it has completely yellowed.  I hope this helps.
Tom

---------- FOLLOW-UP ----------

QUESTION: That is definitely a possible explanation.  However, I was in town today and noticed the same leaf situation in an area not inundated with deer.  Someone mentioned that it was lack of water.  What do you think about that possibility?

Answer
Hi Cathy,
Thanx for the additionaly information.  I should have asked.  Lack of water is definitely a possibility.  In that case, when we are experiencing our typical, hot, humid, rainless July summer days, we give our flowerbeds a good soaking once a week until regular rains return.  Mulching around the plants with straw or bark also helps the plants retain water.  But the fact is, once the blooms are gone, this signals to the lily that it has done its reproductive chore and its greenery will continue to gather energy from the sun for a while but it will also start to degrade as it begins its dormant period.  I hope this helps.
Tom