- Manure
- An organic material excreted by animals (usually from steer is sold commonly) this is used as a fertilizer and an amendment to enrich the soil.
- Mature plant
- A plant that is old enough to produce blooms and seeds.
- Meristem
- Any growing point of both root and stem on a plant, where active cell division is taking place. There are both apical and axillary meristems.
- Microclimate
- In general terms the character of a particular piece of land as influenced by purely local factors like elevation, direction and degree of slope, nearby buildings and vegetation such as trees and hedges, etc.
- Monocot
- Any plant that has only one cotyledon, or seed leaf.
- Monoecious
- Having separate male and female sex organs on the same plant.
- Mulch
- Any loose, usually organic material placed over the soil as a protective covering or for decorative purposes. Common mulches are ground bark, saw dust, leaves or straw.
