Rick589
Songster
You may be right about the batch. I believe that BT has about a two year shelf life and that the effectiveness drops as it ages. Plus heat will destroy it.Best thing I've found for brassicas in general is since they don't need to be pollinated go ahead and cover them with fleece. It's the only sure-fire thing I've found. I was diligent with BT one year and they just laughed at me. Perhaps the batch was old.