In Kate Greenaway's Language of Flowers, the entry for Apple (Blossom) reads: Preference. Fame speaks him great and good.
Keep the full quotation visible
The apple-blossom entry has more than one phrase, including wording that sounds conspicuously old-fashioned to a modern reader. Quoting it accurately is more useful than silently replacing the second phrase with a broad claim about romance.
For a modern message, preference can be explained as choosing someone's company or appreciating a particular person. Make that your own interpretation and label it as such. The dictionary line alone does not establish how apple blossoms were used at a specific wedding or historical event.
FAQ
Is this the same entry as apple fruit?
No. The source lists apple and apple blossom separately, with different assigned messages.
Source
Kate Greenaway: Language of Flowers, plant-to-meaning entries