You are correct that the term 鈥渉ot soil鈥 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鈥攅ven too high鈥攚hich 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 鈥渉ot soil鈥 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鈥攅ven too high鈥攚hich 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!