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| M | |
| Maiden | A one-year old tree or shrub. |
| Maincrop | Vegetables that are allowed to mature. |
| Manure | Animal dung, rotted down and applied to the soil to improve it. |
| Marginal plant | Found at the perimeter of water. |
| Mattock | A tool with one flattened blade and one axe, used for grubbing out trees. |
| Mature | A plant that can produce flowers and fruits. |
| Meristem | Plant tissues capable of creating new cells. |
| Meristem culture | Propagating in the laboratory. |
| Microclimate | A small area which creates its own climate. |
| Micro-organisms | Microscopic plant and animal organisms. Some are beneficial, those that rot down manure and orgainc matter but others cause disease, like mould. |
| Mist-unit | Most tropical houseplants will have started out life in a vast greenhouse with fine mists of water sprayed on them at timed intervals. |
| Mixed border | A border arranged with all sorts of different types of trees, shrubs, herbaceous plants and bulbs. |
| Module | This is a tray with individual cells in which to grow your seedlings without the need to seperate or prick them out. |
| Mole plough | Mostly used on clay soils to make a drainage tunnel. |
| Monocarpic | A plant that dies after flowering and fruiting. |
| Monocotyledon | A flowering plant with one seed leaf. |
| Monoecious | A plant with male and female flowers. |
| Moraine | Alpines would be happy living in this habitat as it is rock chippings. |
| Mosaic | A sympton of a virus disease which makes the leaves patchy in appearance. |
| Mother plant | The one from which you take your cuttings for propagation. |
| Mulch | Placed on top of the soil to prevent weeds and to keep moisture from evaporating. |
| Multistemmed | A tree usually with three main stems growing from the base. |
| Mutant or mutation | The plant differs genetically from its parent. |
| Mycelium | Fine thread-like strands of fungi. |