To be used as decorations on the altar, round the circle, in the home.

Samhain:
Chrysanthemum, wormwood,  apples,  pears,  hazel,  thistle, pomegranates,  all grains,  harvested  fruits and  nuts, the  pumpkin, corn.

Yule:
Holly,  mistletoe, ivy, cedar, bay, juniper, rosemary, pine.
Place offerings of apples, oranges, nutmegs, lemons and whole cinnamon sticks on the Yule tree.

Imbolc:
Snowdrop, rowan, the first flowers of the year.

Ostara/Eostara:
Daffodil, woodruff, violet, gorse, olive, peony, iris, narcissus, all spring flowers.

Beltane:
Hawthorn, honeysuckle, St. John's wort, woodruff, all flowers.

Litha/ Midsummer:
Mugwort, vervain, chamomile, rose, lily, oak, lavender, ivy, yarrow, fern, elder, wild thyme, daisy, carnation.

Lughnasadh:
All grains, grapes, heather, blackberries, sloe, crabapples, pears.

Mabon:
Hazel, corn, aspen, acorns, oak sprigs, autumn leaves, wheat stalks, cypress cones, pine cones, harvest gleanings.

~from Maat's Book of Shadows