Aphrodite: olive, cinnamon, daisy, cypress, quince, orris (iris), apple, myrtle
          Aradia: rue, vervain
          Artemis:  silver fir, amaranth, cypress, cedar, hazel, myrtle, willow, daisy, mugwort, date palm
          Astarte: alder, pine, cypress, myrtle, juniper
          Athena: olive, apple
          Bast: catnip, Vervain
          Bellona: belladonna
          Brigit: blackberry
          Cailleach: wheat
          Cardea: hawthorn, bean, arbutus
          Ceres: willow, wheat, bay, pomegranate, poppy, leek, narcissus
          Cybele: oak, myrrh, pine
          Demeter: wheat,  barley, pennyroyal, myrrh,  rose, pomegranate, bean, poppy, all cultivated crops
          Diana: birch,  willow, acacia, wormwood, dittany, hazel, beech, fir, apple, mugwort, plane, mulberry, rue
          Druantia: fir
          Freya:  cowslip,  daisy,  primrose, maidenhair,  myrrh, strawberry, mistletoe
          Hathor: myrtle, sycamore, grape, mandrake, coriander, rose
          Hecate: willow, henbane, aconite, yew, mandrake, cyclamen, mint, cypress, date palm, sesame, dandelion, garlic, oak, onion
          Hera: apple, willow, orris, pomegranate, myrrh
          Hina: bamboo
          Hulda: flax, rose, hellebore, elder
          Irene: olive
          Iris: wormwood, iris
          Ishtar: acacia, juniper, all grains
          Isis: fig,  heather, wheat, wormwood, barley, myrrh, rose, palm, lotus, persea, onion, iris, vervain
          Juno: lily, crocus, asphodel,  quince, pomegranate, vervain, iris, lettuce, fig, mint
          Kerridwen: vervain, acorns
          Minerva: olive, mulberry, thistle
          Nefer-Tum: lotus
          Nepthys: myrrh, lily
          Nuit: sycamore
          Olwen: apple
          Persephone: parsley, narcissus, willow, pomegranate
          Rhea: myrrh, oak
          Rowen: clover, rowen
          Venus: cinnamon, daisy, elder, heather, anemone, apple, poppy, violet, marjoram, maidenhair fern, carnation, aster, vervain, myrtle, orchid, cedar, lily, mistletoe, pine, quince
          Vesta:  oak
 
Specifically as offerings:

All  watery and earthy flowers and seeds such a s camellia, lily, water  lily, willow stalks; those  flowers used in  Full Moon rituals; white  or purple blooms such as hyacinth, magnolia, heather and lilac; sweet-scented  herbs and flowers; those  dedicated to Venus or to the Moon; rue, vervain and olive.

~from Maat's Book of Shadows