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| H | |
| Ha-Ha | You could have a laugh with your neighbours over this one literally as it is a deep ditch sometimes with a hedge in the bottom, a boundry is formed but the view is uninterrupted. |
| Habit | The natural mode of growth of a plant. |
| Half-hardy | A plant that will not survive prolonged low temperatures, best to overwinter in a greenhouse. |
| Half-pot | A shallow flower pot. |
| Half-ripe | A shoot that is beginning to harden. |
| Half-standard | A tree with only 2-3 ft of trunk with no branches. |
| Hand-light | A small cloche. |
| Harden-off | A plant that has been grown in a greenhouse will have to get used to temperatures outside, it is usual to put the plant in a cold frame. The acclimatization from warm to cold. |
| Hardwood cutting | An autumn cutting taken from ripened wood. |
| Hardy | A plant that survives freezing temperatures. |
| Haulm | Top-growth of vegetables. |
| Heading back | Severe pruning of trees and shrubs. |
| Heel | When heelcutting is in progress, it is a strip of bark that is torn. |
| Heeling in | The storing of plants upright or lying down usually in a trench and the roots being covered over with soil. |
| Herbaceous | A plant with a non-woody stem. |
| Herbicide | Weedkiller. |
| Hollow-tine fork | A rather ingenious fork with hollow prongs, particularily used for aerating lawns by taking a small core of lawn out. |
| Hormone rooting powder | Used for cuttings to regulate their growth. It can also come in liquid form. |
| Hormone weedkiller | Chemicals that affect the growth and then kill weeds. |
| Hose-in-hose | One flower inside another flower, but an illusion. |
| Host | A plant that gives nutrition to a parasite. |
| Hotbed | A layer of soil ontop of rotting manure or compost. The heat generated from the rotting provides a warm base in which early vegetables can be grown. |
| Humidity | Warm air holds more water than cold. A warm bathroom will have more humidity than a dining room. Thailand is a more humid country than England. |
| Humus | Organic matter that is in the final stages of decay. |
| Hybrid | A plant which is the result of crossing two different plant species. |
| Hydroponics | Growing plants in liquid nutrient solutions and no soil. |
| Hypertufa | 2 parts sharp sand, 2 parts coir compost and 1 part fresh cement. This mixture is used to make imitation troughs. |