Layer: to propagate plants by a method similar to cutting, but differing from cutting in that the young plant takes root before it is separated from the parent plant.
Legume: a plant belonging to the family of the pea, clover, and bean; that is, having a flower of similar structure.
Lichen: a kind of flowerless plant that grows on stones, trees, boards, etc.
Loam: an earthy mixture of clay and sand with organic matter.
Magnesia: an earthy white substance somewhat similar to lime.
Magnify: to make a thing larger in fact or in appearance; to enlarge the appearance of a thing so that the parts may be seen more easily.
Membrane: a thin layer or fold of animal or vegetable matter.
Mildew: a cobwebby growth of fungi on diseased or decaying things.
Mold: see mildew.
Mulch: a covering of straw, leaves, or like substances over the roots of plants to protect them from heat, drought, etc., and to preserve moisture.