Sun: Rice, yellow poppy, sunflower, saffron, chamomile, cinnamon, juniper, marigold, peony, musk, frankincense, and all aromatic herbs; citrus, walnut, and palm trees.
Moon: Cabbage, melon, cucumber, pumpkins, endive, lettuce, mushroom, watercress, white lily, white poppy, white rose, rosemary, chickweed, iris, and all night-blooming plants. Among trees: maple, olive, and other sap-bearing trees.
Mercury: Lavender, azalea, marjoram, myrtle, fennel, carrots, caraway seeds, parsley, valerian, savory, horehound, dill. Among trees: walnut, hazel, and filbert.
Venus: Venus rules all sweet-smelling spices and mostflowers from which perfumes are made, as well as grapes, gooseberries, apples, cherries, apricots, daffodils, peppermint, ferns, and many others. Among the many Venus-ruled trees are ash, cypress, fig, almond, pecan, and pomegranate.
Mars: Hot peppers, ginger, radish, onion, garlic, horseradish, mustard, coriander, aloe, basil, broom, capers, tobacco, nettles, thistles, briars, cactus, and all trees with thorns.
Jupiter: Asparagus, chestnut, clove, sage, nutmeg, currants, daisy, dandelion, rhubarb, strawberries, and sugar cane. Trees: oak, birch, ash, linden, and mulberry.
Saturn: Hemlock, nightshade, rue, senna, comfrey, hemp, holly, spinach, ivy, wintergreen, barley, moss, and mandrake. Trees: Cypress, elm, willow, and pine.
Uranus: As Uranus belongs to higher octave planets, it is more concerned with the mental and spiritual realms of consciousness than with the physical (animal, plant, and minderl kingdoms). For this reason, no known species of flora (at least to the writer) is assigned to its rulership.
Neptune: Neptune rules plants which are used as intoxicants, such as Cannabis sativa, the coca leaves from which cokaine is produced, the opium poppy, devil's weed, peyote, and psilocybin mushrooms. In this area neptune may also exert some influence over the coffee bean and tobacco. Neptune has corulership with the moon over many herbs and plants which possess occult properties, as well as the beautiful orchid.
Pluto: None to this writer's knowledge, except for species which have developed and may yet develop as the result of genetic mutation caused by radioactive fallout. According to greek mythology, Hades is especially fond of the narcissus and the cyprus tree.
Source = Alan Oken's Complete Astrology: The classic guide to modern astrology.