Letter - G
- Genus - The name used to describe a group of similar organisms in scientific classification.
- Germination - Growth of a plant from seed.
- Grafting - Attaching one plant to another using a special technique.
Letter - H
- Halophyte - A plant which has adapted to salty soil.
- Hardy - A durable plant which withstand harsh climates.
- Herbicide - A chemical designed to kill plant matter. Usually weeds.
- Hormone - A chemical in plants that regulates its life cycle, including growth, reproduction and food production.
- Humus - The organic components in soil, mainly the decaying matter of plants and animals.
- Hybrid - The result of breeding to different species.
- Hydric - Very moist environment conditions.
- Hydroponics - Growing plants without soil or compost, by adding nutrients to the water.
Letter - I
- Indiegenous - Living naturally in an area, without being introduced by man.
- Insectivorous - Organisms, including some plants, which eat insects.
- Insects - Organisms which can be beneficial to plants or, more likely in a gardeners case, harmful to plants.