Crazee Dayzee

"This is a Crazee Dayzee. Crazee Dayzees look cute, but you won't think they're so cute after they attack you!"

- Goombario

Crazee Dayzees are flower-like enemies that made their debut in Super Mario World 2: Yoshi's Island. They later appeared in the Paper Mario series, Yoshi's Island DS and Yoshi's New Island.

Super Mario World 2: Yoshi's Island
Crazee Dayzees' first appearance is in Super Mario World 2: Yoshi's Island, where they act as minor recurring enemies throughout the game and can have either white or yellow petals. Crazee Dayzees behave identically to Shy-Guys in terms of behavior—however, they can survive being swallowed and spat out, unless they collide with another enemy. An uncommon variation with purple petals that spits out bubbles known as Bubble Dayzee can also be found in some levels.

Yoshi's Island DS
Crazee Dayzees reappear in Yoshi's Island DS, where they act as they did in Super Mario World 2: Yoshi's Island. They are found in many levels throughout the game, including Ba-dum BUM!, Hit the M Blocks!, Mario's Fleet Feet, Baby Mario and Baby Peach: Dynamic Duo and Donuts and Eggs. Notably, the Bubble Dayzees do not appear in this game.

Yoshi's New Island
Crazee Dayzees reappear in Yoshi's New Island and act as the same as they did in the previous installments of the Yoshi franchise.

Paper Mario series
Crazee Dayzees in the  Paper Mario series all have lavander petals and purple feet.

Paper Mario
Crazee Dayzees make their first appearance outside of the Yoshi series in Paper Mario, where they first appear as enemies in Flower Fields. They attack Mario on sight and often fight alongside Bzzaps! and Ruff Puffs. They typically attack by singing, putting Mario to sleep. They will flee from battle when Mario gets their HP low enough. A rare variant known as the Amazy Dayzee first appears in this game, which has higher HP, and much higher attack in comparison.

Paper Mario: The Thousand Year Door
Crazee Dayzees, along with Amazy Dayzees, make a return appearance in Paper Mario: The Thousand-Year Door. In this game, they can be found along the Twilight Trail near Twilight Town. Like in the previous installment, they attack by singing, putting Mario or his partner to sleep (while also piercing defense), and flee from battle at low HP. Amazy Dayzees also appear in the lower levels of the Pit of 100 Trials and alongside other enemies in Twilight Trail. A Crazee Dayzee with green petals, known as Hayzee appears as Luigi's ally. He joined Luigi on his adventure to assemble the Marvelous Compass after being impressed by Luigi performance in the role of "grass" in a play. Hayzee is from a town of Crazee Dayzees known as Jazzafrazz Town, which is the first time that a Crazee Dayzee is shown to be an ally, rather than just a simple enemy.

Super Paper Mario
Crazee Dayzees return in Super Paper Mario. They can be found in the Dotwood Tree and room 58 of the Flipside Pit of 100 Trials. When they sing, a musical note fires from them towards the player like a projectile and puts them to sleep when hit. Its stronger variety, the Amazy Dayzee, also returns.

Super Smash Bros. Ultimate
A Crazee Dayzee appears as a spirit in Super Smash Bros. Ultimate.

Other appearances
In the Super Mario Mash-up for Minecraft, Cornflowers are replaced by Crazee Dayzees.

Trivia

 * An image filename on the Nintendo Kids Club website refers to Crazee Dayzee as "Blume", meaning "flower" in German.