I use BATS in the fall also but didn't realize they have added fertilizer to it. I have an old container and will have to go read the label. Sad thing is, my container will probably last me for life using it like this. lol
Dilute fertilizers certainly wouldn't hurt these plants. The plant my neighbor gave me was well cared for. She watered and fertilized regularly attempting to make it bloom but it just created lush, healthy growth.
Her plant did not bloom till I moved it outdoors for the summer which makes me think that sun is needed for blooming. Just an assessment (not always correct) Kristi