Wishbone Flower, Bluewings 'Clown White'

I planted five Torenia Clown Mix plants into a pot on my sheltered porch, which receives filtered (indirect) sunlight. For awhile, the T...Read Moreorenia plants bloomed beautifully, and then mysteriously died. They were consistently watered, and the other plants in the pot are thriving. It is a shame that they died, because they were an artful addition to the pot, which also contained a white geranium, spikes, and a purple and green birdhouse decorated with yellow flowers (a homemade gift from my granddaughter.) The Torenia were consistently watered, and even treated with Miracle-Gro. What could have gone wrong?