Question
When yellow lillies are done blooming do they need cut back an how long after finished? Thank you

Answer
Hi Sue,
Thanx for your question.  I would cut off the spent blooms but don't cut off any of the leaves.  The leaves are storing sugars for next years bloom and growth.  Once you have had a frost or in the autumn if the leaves turn brown and shrivel then you may trim them off without harming the plant.  I hope this helps.
Tom