It's not just Lowe's. This spring I bought an Asclepias tuberosa (butterfly weed) from Home Depot. When I went to plant it out, I found a tag pushed down in the one gallon pot advising that the plant had been treated with neonics.
NOT what I wanted for a larval host plant, so I took it back. I spoke with the manager and explained that this was a dangerous practice for the monarch butterflies. He did not seem overly concerned. I'm sure that as soon as I left, that plant went back on the shelf to be sold to the next unsuspecting customer.
I will no longer buy plants at 'big box' stores.