Thanks Kathy.
Yes, about the Mermaid/Marmaid. I just checked at the RHS and didn't find the Marmaid, only Mermaid. Hmmmm. I wonder if it was simply corrected?
Regarding Tolumnias - I tossed them last Summer ( and every Summer) for a couple of hours ( a good soak!) into the Bayer's triple stuff and - miracles do happen - they stayed clean so far. I check them every so often, good for now.