- Naturalized
- Established as a part of the flora in an area other than the place of origin.
- Neutral soil
- Soil that is neither acid nor alkaline, having a pH value of 7.
- Nitrogen
- Major plant nutrient especially important for plants where foliage is the main interest.
- Node
- The place on the stem where leaves or branches are attached.
- NPK
- Acronym for the three major plant nutrients contained in manure, compost and fertilizers, and used to describe the amounts of each readily available. N is for nitrogen, P for phosphorus, and K for potassium
- Nutrient
- Any substance, especially in the soil, which is essential for, and promotes growth of plants. Generally applied to a group of a dozen or less common elements, especially nitrogen, phosphorus and potassium.
- Nutrient deficiency
- An inferior state of health in any plant brought about by insufficient amount of a given nutrient being present or available to the plant.
