Tap Root: The main root growing vertically into the soil.
Tender: A plant that has no resistance to frost.
Tendril: A thin, long stem used for attaching to nearby branches, trellis, fences, etc.
Terminal: The flower or bud at the end of a branch or stem.
Thin: To reduce the number of seedlings or young plants to give the remainder room to grow.
Top Dressing: Applying compost or fertiliser to the soil around plants.
Topiary: Clipping shrubs, hedges, etc, into decorative shapes.
Topsoil: The usually more fertile top layer of soil – see subsoil.
Transpiration: Water loss through a plant’s pores in leaves and stems.
Tree: A woody plant usually with a clearly defined trunk with branches above.
Tuber: Like a bulb and a rhizome, this is a modified stem, or sometimes a root, that provides storage for a plant.
Underplanting: The practice of planting low growing plants beneath taller ones.
Variegated: A leaf showing a variety of colours.
Vegetative Propagation: Making new plants asexually, usually by taking cuttings or layering, etc.
Vermiculite: Expanded mica mixed with compost for cuttings to help retain water and give a good air supply.
Weed: This is really any plant that is growing where the gardener doesn’t want it, usually applied to naturally occurring wild plants.
Whorl: Three or more leaves, etc, arising from one place.