Are you learning about measuring with informal units? This resource contains a range of flowers with varying lengthen stems and asks students to choose a unit (we suggest a range of manipulatives) and measure each flower.

You may wish to extend students by modifying what manipulatives they are measuring with, ordering and comparing their shortest to tallest cards.

You could also just use the flower heads attached to differing lengths of dowel, pipe cleaner or straws and display 'planted' in sand or other sensory materials.