Letter - M
- Margins - The edges of a leaf.
- Mildew - A parasitic fungus that grows directly on a plant adversely affecting its growth.
- Mold - Another type of fungus, usually parasitic, which grows on plants affecting their growth.
- Mucigel - A protective coating produced by plant roots.
Letter - N
- Nectar - A sweet liquid produced by a plants flowers.
- Nutrient - A chemical needed by plants to survive.
Letter - O
- Organ - A grouping of cells in a plant that perform a specific function.