Greenhouses. Ziplock bag, wet cotton balls and seeds. You can see all the plant parts. This has a printable for the "house". Although I think I might just tape the bags to the window and have a lot of them.
4 Easy and Quick Parts of a Plant Activities: A Simple Plant Project - 1. Simple 3D Parts of a Plant Craft – Pull together a simple but meaningful craft as students create a 3D flower using items you probably already have around the classroom. Label the parts of the flower to review plant parts.