The Pumpkin Project from Growing in Pre K. Open a pumpkin, add soil & water & watch the seeds already inside the pumpkin grow. Also links to other activities to teach about & observe the pumpkin life cycle. Recommends reading the book "Pumpkin Jack" several times during this process. Add Soil, Ideas, Growing Pumpkin, Remember This, Science Projects, Gardens, Pumpkin Observation, Fall Porches, Pumpkin Life Cycle
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Kinder-pumpkins -- I think I'm going to have to round up some nieces and nephews and give this a try. Looks like lots of fun. It would be fun to add a "field trip" to the pumpkin patch beforehand for inspiration when drawing their pumpkins.
Forcing tulips in water is a fun, easy, and a unique way to present tulips that most people have not seen before. I think showing the natural beauty of the bulb is a pure, modern, and minimalist approach to floral design. Give it a try.