Thanks for linking my articles, Lynn, and for the lovely compliments!
Mary, I think you're making the right choice for your terracotta containers. Semps are very happy in terracotta, and you'll be able to watch them grow all winter in the covered porch knowing they won't get soggy when the rains come. When you water, put an ice cube or two in each pot. As it melts it will moisten more of the soil in the pot, giving the plants' roots a more effective watering. As a bonus you'll have less water dripping on the floor!
