This Smartboard file has everything you need to make your unit on plants interesting.
The first half is a great introduction to your uni, complete with pictures and activities.
The second half is meant to be used as a review. I use this to help my students prepare for the SOLs. It is also a fun way to wrap up your unit.
Topics reviewed are: plant parts (labeling and uses), plant's needs, plant products, plants that grow in Virginia, plant habitats, and the plant life cycle.