Rooting cuttings:
Professional nurserymen use vermiculite for the insertion of cuttings. Use directly as poured from the bag, water thoroughly and insert cuttings.
Soil amending:
Where native soil is heavy (clay), mixing vermiculite is recommended to increase air space. Where the soil is sandy, mixing vermiculite is also recommended, Its water retention allows the amended soil to hold more water, decreases drought stress, and maintains vigorous plant growth.