GARDEN: To tend or cultivate an area of ground; the piece of ground receiving this attention.
GARDEN CENTRE: A retail outlet for plants, sundries and other gardening accessories.
GENUS (plural genera): A group of plants all very similar in characteristics to each other, e.g., members of the genus sorbus (mountain ash and whitebeam) are all recognizably alike in many details. The generic name (in this case sorbus) is like a person’s surname, the specific name (see species) being akin to a first name.
GERMINATION: The stage at which a seed begins to grow roots and shoots to become a plant.
GLASS: In gardening parlance, a collective term referring to all structures made entirely or partly of glass or other light-transmitting material and designed for the protection of plants.
GRAFT: A process in which one plant is artificially combined with another. The main reason for doing this is to ‘borrow’ some of the characteristics from the rootstock (the part receiving the graft) for the scion (the piece being grafted on). For example, an apple tree may grow far too large on its own roots. If a piece of it is grafted on to a ‘dwarfing rootstock’ it will inherit the slower growth habit of the stock, while retaining its own fruiting characteristics.
GRASS: Plants which are members of the Graminaceae family, having strap-, spike-or sword-like leaves and usually feathery flower-heads. Grass is also the term used to describe thin, grass-like leaves produced by young bulbs and sometimes bulbs suffering from certain disorders.
GREENHOUSE: A structure of glass or other transparent material on a wooden or metal framework for the cultivation and protection of plants, mainly ones which through some or all of their lives could not survive out of doors in a particular environment. Greenhouses are generally used to protect plants from low temperatures, but can also be used to protect them from excessive moisture. An example of this is the alpine house, which is not heated, but is used to house collections of alpines, plants whose normal habitat is crisp, dry localities and that take exception to our cold, damp winters if permanently planted outside.
GREEN VEGETABLES: Ones grown primarily for their leaves, e.g., cabbage, spinach, etc.
GROUND COVER PLANTS: Ones suitable for close planting which will eventually cover the ground completely and so exclude weeds.
GROWING BAG: A long, flattish, heavy-duty plastic sack filled with potting compost which is used as a temporary container in which to grow plants, especially vegetables.
GROWING TIP: The tip of a shoot, from which growth is made.