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| A | |
| Acid | Soil with a pH below 7. |
| Activator | Composting process speeded up with the use of a chemical. |
| Adventitious | Unusual root growth similar to ivy or buds which appear as a result of damage. |
| Air Layering | A way of making a plant form roots above ground by cutting into the stem and placing soil around it. |
| Aeration | Usually a way of making holes in your lawn to allow air to circulate around the roots and make it less compact. |
| Algae | Microscopic plants that can appear anywhere, ponds, composts and the greenhouse being the more common places. |
| Alkaline | Soil with a pH over 7. |
| Alpines | Plants that come from mountainous regions and therefore best suited to rockeries. |
| Annual | This is a plant that can grow from seed, flower, fruit, set seed and die all in one year. |
| Anther | The male sexual organ of the flower which produce pollen. |
| Apex | The tip of a stem, the uppermost part of the plant. |
| Apical bud | The bud on a shoot. |
| Apical dominence | The plant inhibits the growth of buds other than the topmost, this topmost bud grows rapidly and reaches the light ensuring plant survival. |
| Aquatic plant | This plant lives only in water. |
| Arboretum | A collection of all types of trees and shrubs. |
| Arris rail | The bar that goes across the top of a fence |
| Auxin | This naturally occuring hormone affects the growth of plants. |
| Axil | The upper angle between the leaf, or leaf stalk and the stem it is growing on. |
| Axillary bud | This bud actually grows from the axil. |