MANURE: Organic matter, excreted by animals, which is used as a soil amendment and fertilizer. Green manures are plant cover crops which are tilled directly into the soil.
MANURE TEA: Manure and fertilizers dissolved in water, resulting in liquid manure.
MARGINAL PLANT: Plants that will grow on the edges of ponds or lakes.
MASS PLANTING: The planting of one particular flower or many of the same kind close together.
MICRO-CLIMATE: Variations of the climate within a given area, usually influenced by hills, hollows, structures or proximity to bodies of water.
MICRO-NUTRIENTS: the nutrients needed in small amounts by plants: iron, manganese, zinc, copper, molybdenum, boron and chlorine.
MICRO-CUTTING: A plant produced by micropropagation - a modern technique using tiny pieces of the parent plant on a sterile nutrient jelly.
MICRO-ORGANISMS: Animals and plants that are too small to be seen clearly with the naked eye.
MILDEW: Several different types of fungi. Two well-known types are downy and powdery. It leaves a white dusty type of coating on the leaves. Plant disease resistant varieties.
MIST PROPAGATION: The ideal method of propagation of cuttings under greenhouse glass, using automatic mist generators and soil heaters.
MOIST BUT NOT WET: Plants that grow well in moist conditions but not entirely wet. Soil that can be squeezed and hold its shape but not excrete water, yet break apart easily.
MONOECIOUS: plants that have both male and female flowers on the same plant.
MOUTH: The open end of a bell shaped or tubular flower.
MULCH: Any loose material placed over the soil to control weeds and conserve soil moisture. Usually this is a coarse organic matter. Common mulches are grass clippings, leaves, saw dust, or straw.
MULTICOLOUR: A flower with petals which bear at least three distinctly different colors.
MUTATION: A change in the genetic make-up of a plant, leading to a new feature. This new feature can be inherited.