I found this list of flowers and what they mean that I thought was interesting. (But I plan on just using local flowers that are in bloom at the time, so the meaning will be kind of...meaningless.)
Baby’s breath = Everlasting love
Bachelor’s button = Celibacy, delicacy
Calla lily = Magnificent beauty
Carnation (pink) = Woman’s love
Carnation = Pure love
Cornflower = Delicacy
Crocus = Cheerfulness
Daisy = Innocence
Dogwood = Duration
Fern = Magic
Forget-me-not = Remember me
Freesia = Innocence
Fuchsia = Confiding love
Geranium = True friendship
Hellebore = Calming
Hyacinth = Sport and play
Iris = I have a message for you
Ivy = Friendship
Jasmine (pink) = I attach myself to you
Jasmine (white) = Amiability
Lady’s mantle = Comfort
Lilac = First emotions of love
Lily-of-the-valley = Return of happiness
Mint = Virtue
Myrtle = Love
Oak leaf = Bravery
Orchid = You’re in my thoughts
Peony = Bashful
Peppermint = Warmth of feeling
Primrose = Youth
Ranunculus = Radiant with charms
Rose (white) = I am worthy of you
Rose = Love
Rosemary = Remembrance
Snowdrop = Hope
Sweet pea = Delicate pleasures
Sweet violet = Modesty
Sweet William = Sensitivity
Tulip (pink) = Caring
Tulip (variegated) = Beautiful eyes
Tulip = Declaration of love
Violet (blue) = Faithfulness
(via style me pretty)