Since many years we planted tomatoes and dahlias with great success.. Since three years the plants come up beautifully but then wilt and die. This happens only in one location in our back yard.(the sunny corner). Could something be wrong with the soil? Where can we have a soil test done?
Soil test results will give the pH of the soil, liming, and nutrient deficiencies. It will not tell you why your plants wilted.
.We would like to see photos of the dahlias and tomato plants.
Some reasons for wilt include poor drainage, overwatering, underwatering, are they located in the vicinity of a black walnut tree, (tomatoes) and possible wilt diseases. See our publication on tomatoes for symptoms and causes http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG56%20IPM%20Tomatoe...