Here are a couple of fun activities for science stations. The activity on the first page has the students drawing and labeling a flower. You could do this activity in conjunction with students planting their own flowers, and they can work to draw their flowers as they see them.
I also thought this activity would be fun to do as a watercolor resist activity, where students use crayons to draw their flowers and then paint over their flowers with watercolor paints.
The last page is a simple crossword puzzle for students to do to help reinforce the parts of plants.
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