What does it mean for a boy to send me nine roses?

Nine roses mean: long-lasting, lasting and firm love.

1 Hua: You are the only one for me.

Two flowers: There are only you and me in the world.

Three flowers: I love you.

4 Flowers: Vows, Commitments

5 flowers: no regrets

6 flowers: All the best, smooth sailing and unity forever. Wish you all the best.

7 Flowers: Have a crush on you

Hua: You made up, apologized, made up, and deeply apologized. Please forgive me.

9 flowers: long and strong.

10 flower: perfect

1 1 Hua: Love you all your life.

12 flower: all love flies with me, completely combined, soul mate, missing each other every day.

13 flowers: friendship lasts forever.

14 flower: Yi Lee vermicelli Yisi.

15 flower: keep your people.

16 flower: smooth sailing.

17 flower: accompany you all your life.

18 flowers: youthful and beautiful

19 flower: tenacity and expectation, endless love.

20 Flowers: I have only one sincere heart, two of a kind, and I will love you forever.

References:

Encyclopedia of marriage