I received a cactus bouquet on my 50th birthday, from my wife.
My graduation bouquet, my mom gave it to me, I still have it my wall.

I know the quality of the pic is awful, I took it with my laptop,sorryyy!!but I just had to put it.
My husband sent me a dozen roses while I was at work, just because.
When I graduated from high school back in 1965, my cousin sent me a bouquet of lollipops and roses .... I loved that!
It was a flower, (single rose, I believe) not flowerS, but it was after a first "encounter" with a certain someone.

One of my favorites is the lei that my family made for my graduation. It was the whole experience that brings back such fond memories.
My mother and her family come from Hawaii. A long tradition was lei making for special people on special days. Not only a tradition it was a special ritual. One that only the females in our family experience. Most common is on graduation and wedding days. I have happy memories of lei making at my grandmothers house.
When I was little, I would wake up on those days to the smell of flowers. Because the women in the family had made the trek to the flower mart at dawn. When I got older being able to go with the ladies in our family to the flower mart was a rite of passage. Breakfast was made, the men and children fed, and out of the house they would go, leaving the women and young ladies at home to cook and make leis. We also had a feast, party or reception at the end of those days. So usually the kitchen had been going for a week at least. My other female relatives and my family's best friends would come by before noon and what commenced was an army of women cooking, preparing, bonding, and laughing. Making the most beautiful leis and the most scrumptious of dishes.
On my graduation day the above madness only wavered when my grandmother and mother had to leave with my lei to watch my graduation and present with flair that gorgeous lei. My lei took dozens of flowers to make and every flower was put on by every woman who attended that day. That too was a part of the ritual. I wore that lei as I walked down that aisle and all that day as a badge of honor. Proud of my accomplishment and the honor of my family. Humbled by the care that each women took to assemble my flowers.
My soul-mate sent me a beautiful bouquet of many colorful flowers, while I was at work, on our first anniversary. At first the other guys started to kid me then they became jealous. (LOL)
The flowers I received from my husband for my first Mother's Day. He put my son's handprints on the inside of the card he got for me.