The flowers have their galateo that suggests some rules generates them to hold every time in consideration that it agrees to give a flower or a bunch of flowers.

Acacia:
Secret love
Acorn:
Nordic symbol of life and immortality.
Aloe:
Grief.
Allspice:
Compassion.
Ambrosia:
Love returned.
Amaryllis:
Pride, Timidity
Anemone:
Unfading love.
Angelica:
Inspiration.
Aniseed:
Restoration of youth
Arbutis:
Only love.
Apple:
Preference.
Aster:
Love, daintiness.
Azalea:
Take care of yourself for me; fragile passion, Chinese symbol of womanhood.

Bachelor Button:
Celibacy.
Baby's Breath:
Everlasting Love.
Basil:
Best Wishes, Love.
Bay Leaf:
Strength.
Begonia:
Beware.
Bells Of Ireland:
Good luck.
Bird of Paradise:
Magnificence.
Bittersweet:
Truth.
Bluebell:
Humility, constancy.
Borage:
Courage.
Bouquet of withered flowers:
Rejected love.
Burnet:
A merry heart.
Buttercup:
Cheerfulness.

Cactus:
Endurance, warmth.
Calendula:
Joy.
Camellia:
Admiration, perfection, good luck gift to a man.
Candytuft:
Indifference, Carnation (in general) Bonds of affection, health and energy, fascination, woman love.
Carnation (pink):
I'll never forget you.
Carnation (purple):
Capriciousness, whimsical, changeable.
Carnation (red):
My heart aches for you, admiration.
Carnation (solid color):
Yes.
Carnation (striped):
No, refusal, sorry I can't be with you, wish I could be with you.
Carnation (white):
Sweet and lovely; innocence; pure love; woman's good luck gift.
Carnation (yellow):
Rejection, disdain.
Cattail:
Peace, prosperity.
Chamomile:
Patience, attracts wealth.
Chrysanthemum (in general):
Cheerfulness, You're a wonderful friend.
Chrysanthemum (red):
I love.
Chrysanthemum (white):
Truth.
Chrysanthemum (yellow):
Slighted love.
Coreopsis:
Always cheerful.
Coriander:
Lust.
Cowslip:
Pensiveness, winning grace.
Crocus:
Cheerfulness, abuse not.
Cyclamen:
Resignation and goodbye.
Clover:
Good luck.

Daffodil:
Respect.
Daisy:
Innocence.
Dandelion:
Wishes come true.

Eucalyptus:
Protection.

Fennel:
Worthy of all praise.
Fern:
Delicatezza e primo amore.
Sincerity:
Verginità, fecondità, purezza e per i più coraggiosi richiesta di matrimonio.
Fern (Magic):
Fascination, confidence and shelter.
Fern (Maidenhair):
Secret bond of love.
Feverfew:
Protection.
Fir:
Time:
Flax:
Domestic symbol, fate.
Flax:
Domestic symbol, fate.
Forget me not:
True love, memories.
Forsythia:
Anticipation.

Gardenia:
You're lovely, secret love
Garland of roses:
Reward of virtue.
Garlic:
Courage, strength.
Geranium (Scented):
Preference.
Gladiolus:
Love at first sight.
Grass:
Submission, utility.

Heather (lavender):
Admiration, solitude.
Heather (white):
Protection, wishes will come true.
Hibiscus:
Delicate beauty.
Holly:
Good will, Defense, domestic Happiness, foresight.
Honeysuckle:
Generous and devoted affection.
Hyacinth (general):
Games and sports, rashness, flower dedicated to Apollo.
Hyacinth (purple):
I'm sorry, please forgive me, sorrow.
Hyacinth (red or pink):
Play.
Hyacinth (white):
Loveliness, I'll pray for you.
Hyacinth (yellow):
Jealousy.
Hydrangea:
Thank you for understanding, frigidity, heartlessness.
Hyssop:
Wards away evil spirits.

Iris:
Faith, hope, wisdom and valor.
Ivy:
Fidelity and friendship.
Ivy:

Jasmine:
Amiability, attracts wealth.
Jonquil:
Love me, affection returned, desire, sympathy, desire for a return of affection.

Larkspur:
Pink, fickleness.
Lavender:
Devotion.
Lemon:
Zest.
Lemon Balm:
Brings love.
Lily (general):
Keeps unwanted visitors away.
Lily (calia):
Beauty.
Lily (day):
Coquetry.
Lily (eucharis):
Maiden charms.
Lily (orange):
Hatred.
Lily (tiger):
Wealth, pride.
Lily (white):
Virginity, purity, majesty, it's heavenly to be with you.
Lily (yellow):
I'm walking on air; false and gay
Lily of the valley:
Sweetness, return to happiness, humility.

Magnolia:
Sweetness, beauty, love of nature.
Marigold:
Comforts the heart.
Mint:
Protection from illness, warmth of feeling.
Marjoram (sweet):
Joy and happiness.
Mistletoe:
Kiss me, affection, to surmount difficulties, sacred plant of India.
Monkshood:
Beware, a deadly foe is near, chivalry.
Moss:
Maternal love, charity.
Myrtle:
Love, Hebrew emblem of marriage.

Narcissus:
Egotism, formality, stay as sweet as you are.
Nasturtium:
Conquest, victory in battle, maternal love, charity, patriotism.

Oleander:
Caution, beware.
Orange:
Generosity.
Orange Blossom:
Brings wisdom.
Orange Mock:
Deceit.
Orchid:
Love, beauty, refinement, beautiful lady, Chinese symbol for many children.
Orchid (cattleya):
Mature charm.

Palm leaves:
Victory and success.
Pansy:
Thoughts, love.
Peach:
Longevity.
Peony:
Aphrodisiac.
Petunia:
Resentment, anger, your presence soothes me.
Pine:
Hope, pity.
Poppy (general):
Eternal sleep, oblivion, imagination.
Poppy (red):
Pleasure, consolation.
Poppy (white):
Consolation, sleep.
Poppy( yellow):
Satire.
Primrose:
I can't live without you, early youth.
Primrose (evening):
Inconstancy.

Rose (general)(Red):
Love, I love you.
Rose (white):
Eternal Love, innocence, heavenly, secrecy and silence.
Rose (pink):
Perfect happiness, please believe me.
Rose (Yellow):
Friendship ; jealousy; try to care.
Rose (Black):
Death.
Rose (red and white):
Together, unity.
Rose (thornless):
Love at first sight.
Rose (single, full bloom):
I love you; I still love you.
Rose bud:
Beauty and youth, a heart innocent of love.
Rose bud (red):
Pure and lovely.
Rose bud (white):
Girlhood.
Roses (Bouquet of full bloom):
Gratitude.
Roses (Garland or crown of):
Beware of virtue, reward of merit, crown, symbol of superior merit.
Roses (musk cluster):
Charming.
Rose (tea):
I'll always remember
Rose (cabbage):
Ambassador of love.
Rose (Christmas):
Tranquilize my anxiety, anxiety.
Rose (damask):
Brilliant complexion.
Rose (dark crimson):
Mourning.
Rose (hibiscus):
Delicate beauty.
Rose leaf:
You may hope.
Rosemary:
Remembrance.

Sage Wisdom:
Long life.
Salvia (blue):
I think of you.
Smilax:
Loveliness.
Snapdragon:
Deception, gracious lady, presumption.
Spiderflower:
Elope with me.
Stephanotis:
Happiness in marriage, desire to travel.
Stock:
Lasting beauty.
Strawberry:
Perfect goodness.
Sunflower:
Loyalty, wishes.
Sweetpea:
Goodbye, departure, blissful pleasure, Thank you for a lovely time.

Thyme:
Strength and courage, ensures restful sleep.
Tulip (general):
Fame,charity, perfect lover.
Tulip (red):
Believe me, declaration of love.
Tulip (variegated):
Beautiful eyes.
Tulip (yellow):
Hopeless love.

Violet:
Modesty, calms tempers, induces sleep.
Violet (blue):
Watchfulness, faithfulness, I'll always be true.
Violet (white):
Let's take a chance on happiness.
Viscaria:
Will you dance with me?

Woodruff:
Sweet humility.

Yarrow:
Health, healing.

Zinnia:
Thoughts of friends.
Zinnia (magenta):
Lasting affection.
Zinnia (mixed):
Thinking of an absent friend.
Zinnia (scarlet):
Will you dance with me?
Zinnia (white):
Goodness?
Zinnia (yellow):
Daily remembrance?