Walnut Walnut has a reputation as a sinister tree. It's thought to kill any vegetation near it, and there is a recurrent thread on rec.gardens about what can be planted under a black walnut.
Walnut trees seems to especially dislike oaks.
In the evening, if you walk underneath a walnut tree, you can hear the devil's servants whispering up in the branches. In Bologna the peasantry believed that witches held their meeting under a walnut tree on Midsummer's Eve. European folklore also tells us that a heavy crop of walnuts indicates a harsh winter. To dream of walnuts implies unfaithfulness in relationships. Carrying a spider in a walnut shell was supposed to prevent fevers.