I guess where this would lead to is......
What do others in your area charge for landscaping and how is all that set up.
You mention an Industry standard that labor for replacement is to be paid for....Well.....where I am, that isn't policy.
How different in price was your cost for the work last September as compaired to others? And how is it formulated and as compared to others?
What I mean is...........Do you just charge material cost plus labor? or do you add on a % for the material plus labor.........or with concerns to plants do you X2 or X3 or what ever and that includes plants, installation and guarantee.
Everyone is different.......but I think you will find that there are many that do it similar.....
Myself I do 2x - 3x the cost of the plant. That covers installation and 1 year guarantee......I don't guarantee annuals and certain perennials ( that would be listed on contract )
They get 1 replacement......if that same spot should need another, we'll plant another under the guarantee ( at my discression ).......till the one year is up......now I will stretch and play possum with them trying to get a 3rd or 4th replacement.....
I have heard of charging labor for replacements several years ago. Just never heard of anyone doing it over the years.
I can understand a labor charge if your mark up wasn't enough...but then that would reflect in the estimate price of the job as compared to others........and if that is the case......then you need a clause in your contract stating replacement labor charges.