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| Wall-nail | A strong nail for the wall with a tag integrated onto the end for training climbers |
| Wardian case | A decorative container for growing plants but originally used for exhibition transportation . |
| Watering-in | Instructions for planting in a tree or shrub:To water not only the soil in the hole that is ready for planting but when the plant is in place and the soil replaced around it, plenty of water will settle the soil and you will see if you need some more. |
| Water shoot | A vigorous sappy shoot sometimes gorwing after drastic pruning. |
| Water stress | A plant is losing water faster than it can take it up. |
| Water table | The level in the soil below which the soil is saturated by ground water. |
| Wattle fencing | Panels of willow or hazel shoots used for fencing. |
| Weaning | The gradual process of acclimatising seedlings to cooler temperatures. |
| Weeping tree | A tree whose branches grow downwards. |
| Wetting agent | A chemical added to a liquid to help its adherence qualities. |
| Whip | A young single stemmed tree. |
| Wind-rock | The loosening of a plants roots due to strong winds. |