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- Genus
- Group of closely related plants but distinct enough not to interbreed. Usually consists of several species. Plural - genera.
- Germination
- Development of seedling from fertilised seed.
- Girdling
- See Ring barking.
- Girth tape
- A tape used to measure the diameter of a tree. Although it is put round the circumference of the stem, it is calibrated to read the measurement as centimetres diameter.
- Glaucous
- Term describing waxy film on the surface of a leaf or stem, giving it a bluish appearance and serving to reduce water loss.
- Grafting
- Artificial union of aerial parts of one plant with the vigorous rootstock of another.
- Granny
- An old, branched tree often, but not necessarily, surrounded by young vigorous trees. Usually applied to Scots pine or European larch.
- Green tonne
- Weight measurement of timber fresh felled before any natural or artificial drying has occurred.
