Magic Moss and Mulch can be purchased through your nearest garden centre or retail outlet - or online here.
Magic Moss is long stranded sphagnum moss that is usually associated with hanging baskets. Make one here !
However let us inform you that moss is best used on and under the soil.
Mixing moss into your soil will benefit your growing medium as it will allow extra absorbtion of water and nutrients to the soil. (A great benefit to lemon trees and other citrus).