Got the book (the wonderfully informative "
How to Hold a Crocodile" I have a hardback copy of the 1981 edition) In the 19th century there were apparently flower dictionaries to aid interpretation.
Good alternatives to Roses could be
Bluebell - Constancy
Cedar Leaf - I live for thee
Jonquil - Please return my affection
Spearmint - Warmth of sentiment
Water Lily - Purity of heart
But probably best to avoid
Red Balsam - Touch me not
French Marigold - Jealousy
Lavender - Distrust
Evening Primrose - Inconstancy
Snakesfoot - Horror