“Is it safe to re-use Black Gold for starting seeds, etc.? Do I need to sterilize it the following year before planting? I had several flats of seeds with low germination or die-off last Spring and would like to use the soil again. Thanks.” Question from Piper of Petersham, Massachusetts
Answer: It is always safer to start with fresh Black Gold Seedling Mix. This will ensure the mix is ready for growing and pest and disease free. Always choose a bag that’s closed at the ends and has no holes, to make sure the mix inside is fresh. the
Old mix can, however, be sterilized for reuse. It will not be as fresh, but the sterilization process will ensure it is pest and disease free. In fact, I sometimes sterilize fresh seedling mix when I am starting prized seeds. To sterilize mix, I place it in a large, oven-safe pan, add some water to moisten the mix, and then cover it with aluminum foil. Then I bake it at 180-200 degrees Fahrenheit for at least 30 minutes. The soil’s internal temperature should be at least 180 degrees F for sterilization. Allow the mix to cool before use.
Happy seed starting!
Black Gold Horticulturist