Many commercial potting mixes already contain
Trichoderma fungi. However, bulk granules of
Trichoderma can be mixed in with the soil before
transplanting. Or Trichoderma can be applied to the
soil surface after transplanting, in the same manner
as application of a granular fertilizer. Incorporation
of Trichoderma fungi is especially important in
sterilized soils to restore or establish a population of
beneficial micro-organisms to out-compete pathogens.
Trichoderma are aerobic, meaning they require
oxygen, so it is best not to waterlog the growing
media for too long