You can consult the Trademark Office, where there is a special classification number list.

According to your "contempt", I add that flowers belong to class 3 1. Write it down for you:

3 1 class-greening trees; Unprocessed grains and agricultural products; Flowers and horticultural plants; Biology; Unprocessed fruits and nuts; Seeds; Fresh vegetables; Feed and additives; Live fish and poultry;

In addition, you can choose other categories according to whether you sell flowers or rent flowers, but a trademark can only fill in one international classification number, and a trademark can only fill in one category of 10 goods (services).

My answer just now was too concise. I hope my supplementary answer can help you! Or at least no longer despised by you, hehe ~