I used this activity for all of my primary grades and it worked very well for K-2. We talked about what plants need in order to grow and survive and then we created our very own paper flowers.
I chose to print my flower pots onto colored paper and the leaves on white paper. The students then colored the leaves green (I also mentioned photosynthesis for the GT kids), and created a construction paper stem and their very own flower out of construction paper as well.
These are now hanging in my science classroom windows and add an abundance of color and joy to my room!