I have recently sown lettuce seeds, which were pre-mixed with vermiculite. I have since discovered that some vermiculite still contains asbestos. Is this correct?
Certified GKH Gardening Expert
As long as the vermiculite was purchased recently, as in the past few years, there is no concern about asbestos. The asbestos was found in vermiculite harvested several years ago and would not be in today's supply.