Answer:

gladiola

AnswerCrossword Clue
GLADIOLASword lily
GLADIOLABloom with sword-shaped leaves
GLADIOLAFlower with sword-shaped leaves
GLADIOLAIris' cousin
GLADIOLAPlant with sword-shaped leaves
GLADIOLAIris plant.
GLADIOLARelative of an iris
GLADIOLAColorful bloom
GLADIOLAHappy flower?