You are correct that the term “hot soil” isn’t referring to the popularity nor the temperature; rather, it refers to the nutrient content of the soil. I don’t believe this usage is all that common, but it appears to mean soil that has a high nutrient content—even too high—which can actually be bad for plants.
Generally, any organic soil that’s meant for use in containers should do the trick. No need to get overly fancy!
You are correct that the term “hot soil” isn’t referring to the popularity nor the temperature; rather, it refers to the nutrient content of the soil. I don’t believe this usage is all that common, but it appears to mean soil that has a high nutrient content—even too high—which can actually be bad for plants.
Generally, any organic soil that’s meant for use in containers should do the trick. No need to get overly fancy!