You may be right, and the plant is getting rid of toxins in its sap, by exuding them out throught the leaf stomata (pores). Try using rainwater instead, as there's usually plenty of that about! See what hapens and report back (private message, if you like). Phil J

Thanks Philjeffs! Just as the weather turns nice too!

Sometimes excess fertilizer will do that, too!

Thanks Tugbrethil. I'm ashamed to say that it's unlikely in this particular instance though.

Weeeellll...at least too little feeding rarely kills plants! : )

I'm embarrassed! Promise to feed it come spring!
Do they like lots of water when in bloom?

They like regular water all the time, but the detest boggy conditions. I would water it when the top 1/2 cm of soil is dry. Phil J is also right about the kind of water to use.