It would appear that I jumped the gun on spring planting. Went out this morning to discover a hard frost on everything, including my new tomato plants. By afternoon, they were black withered lumps.
I should have checked the average last freeze date -- easy to find on-line now that I bother to look. It's between May 1 and May 15 in this area of Kentucky!!
So its back to nursery for more plants in a day or two. This time I think I'll patronize my favorite local greenhouse/fruit stand "The Golden Apple" which appear to have opened for the season this week.