Calendula.  It’s a gateway drug, I tell you.  I grew some in the garden this year as my first foray into flowers, and because I had a vague idea that I could make soap this winter.  Springtime is full of optimists.  What was I thinking?  I’m not going to make soap.  There are lots of good soapmakers already, and I’ve got a tiny house to build.  But hot damn, my calendula plant produced dozens and dozens of flowers over its lifespan, and this last bit of warm weather has lengthened its staying power. So here I am, drying out the flower heads thanks to a compulsive need to preserve as many garden products as possible.  Then it occurs to me that I have to do…