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| Meadow Lychnis | Wit. |
| Meadow Saffron | My fast days are fast. |
| Meadowsweet | Uselessness. |
| Mercury | Goodness. |
| Mesembryanthemum | Idleness. |
| Mezereon | Desire to please. |
| Michaelmas Daisy | Afterthought. |
| Mignionette | Your qualities surpass your charms. |
| Milfoil | War. |
| Milkvetch | Your presence softens my pains. |
| Milkwort | Hermitage. |
| Mimosa (Sensitive Plant) | Sensitiveness. |
| Mint | Virtue. |
| Mistletoe | I surmount difficulties. |
| Mock Orange | Counterfeit. |
| Monkshood (Helmet Flower) | Chivalry. Knight-errantry. |
| Moonwort | Forgetfulness. |
| Morning Glory | Affectation. |
| Moschatel | Weakness. |
| Moss | Maternal love. |
| Mosses | Ennui. |
| Mossy Saxifrage | Affection. |
| Motherwort | Concealed love. |
| Mountain Ash | Prudence. |
| Mourning Bride | Unfortunate attachment. I have lost all. |
| Mouse-eared Chickweed | Ingenuous simplicity. |
| Mouse-eared Scorpion Grass | Forget me not. |
| Moving Plant | Agitation. |
| Mudwort | Tranquillity. |
| Mugwort | Happiness. |
| Mulberry Tree (Black) | I shall not survive you. |
| Mulberry Tree (White) | Wisdom. |
| Mushroom | Suspicion. |
| Musk Plant | Weakness. |
| Mustard Seed | Indifference. |
| Myrobalan | Privation. |
| Myrrh | Gladness. |
| Myrtle | Love. |