Plum

The plum, Prunus domestica, is a deciduous tree of the rose family that includes many of the fruit trees called plums in English, and the greengages and damsons as subspecies. Wikipedia says it forms a large shrub or small tree, bears white blossom in early spring, and has a single large stone in each fruit. Cunningham calls it feminine, with Venus and water, and gives the powers of love and protection. He has plum branches placed over doors and windows to guard the home against evil, and the fruit eaten to inspire or maintain love. He marks the seed and the wilted leaf X, set out in the safety notes. Kynes gives plum no entry, so the entry rests on Cunningham and Wikipedia alone.