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| F | |
| F1 | A plant that is the result of a cross between two parent strains, usually with the best features of each. |
| F2 | Cross two F1's to create an F2. |
| Fallowing | The land is left to rest. |
| Falls | Outer Iris petals which hang down. |
| Family | A group of related genera. |
| Fan or fan-trained | A shrub or tree whose branches are trained in the shape of a fan against a wall or other type of support. |
| Fasciation | Two stems weld themselves and become flat. |
| Feathered | This is a young tree whose branches have not been pruned. |
| Fertilizer | Organic or inorganic(chemical) material that provides food for plants. |
| Festooning | Fruit trees that are trained by tying their branches down. |
| Fibrous roots | A root system with masses of small roots. |
| Fillis | Soft string. |
| Fimbiate | Fringed petals. |
| Flocculation | When lime is applied to clay the particles bind together. |
| Florets | Lots of small flowers very close together, like broccoli. |
| Flowers of sulphur | Sulphur is usually used to correct the pH of an alkaline soil. Please do not use this material unless you understand where and how it has been obtained. |
| Flushes | Irregular but successive crops of flowers or fruits. |
| Foliar feed | A liquid fertilizer sprayed directly onto the leaves and absorbed by them.. |
| Foot | The base of the main stem of a herbaceous plant. |
| Forcing | Warmth will accelerate plants or seeds to grow especially at times of the year when they normally would not. |
| Forking | Digging over an area of garden with a fork or lifting vegetables like potatoes. |
| Form | A variation or different strain of a plant.. |
| Frame | A stucture used to grow early crops as well as acclimatize seedlings to a colder environment. |
| Friable | An excellent type of soil that is moist, light, crumbly and in small pieces. |
| Fritted trace elements | A formulation of plant nutrients which remain available in alkaline soils. |
| Frost lifting | Lifting plants after a hard frostl. |
| Frost pocket | A depression in the landscape where frost collects. |
| Fruit bud | This is not a wood bud but rather one that will produce fruit. |
| Fruit cage | A structure preventing birds from eating your fruit. |
| Fungicides | A substance used for the prevention or cure of disease caused by fungi and some bacteria. |
| Fungus | A member of a group of non-flowering plants that are not green and cannot manufacture their own food. They live off either decaying organic matter or off a living organism. |