Plant scientists use their curiosity and knowledge to develop questions about the world of plants. Then they try to answer those questions with further observations and experiments in the laboratory and in the field. To earn this merit badge, Scouts will explore three of the most important plant science specialties: agronomy, horticulture, and field botany.

Get the workbook:  http://usscouts.org/mb/worksheets/Plant-Science.pdf
Also available as a word doc... all are here  http://usscouts.org/mb/worksheets/list.asp
5.  Grow a plant with one method (seed is easy)
6.  in the worksheet
7. in the worksheet write the paragraph
Pick option 1, 2 or 3 and do it.  log work in worksheet and take photos to share