My friend Diane has a similar concrete double tub in her back yard, nearly all of which is devoted to fruits, vegetables, and herbs. I can't recall what she has growing in the tub, but it looks right at home in her whimsical, arty scene composed almost entirely of reclaimed and re-used materials, including some pavers we gave her when we poured a slab for our hot tub.
Rich, our Mia loved bananas, melon and popsicles, right up until she left us a little over a year ago at around 14 years old. A sweet girl with a sweet tooth. She never liked riding in cars much. That was a favorite pastime of a Siamese mix my sister had. He'd curl up in the passenger's seat if anybody's car window was open, just hoping someone would come along and take him for a ride.
BTW Phil, you made a good choice. I always wanted a tub with a cabinet surround, but no longer have the dimensions to accommodate one.