It's jack-o'-lantern season in Arkansas, and that means bowls full of slimy pumpkin "guts" on kitchen tables from Fayetteville to the Delta. Before that goop hits the trash, here's a better idea: it's a ready-made science lab.
This week the University of Arkansas System Division of Agriculture published tips on what to do with pumpkin innards (Oct. 15, 2026). Their extension experts suggest a simple trick: soak the scooped-out mess in water and work it gently with your hands. The seeds float and the pulp sinks. A fruit and vegetable specialist also explains that the pulp acts as a protective layer around the seeds, which is a great "why" question to put to your kids.
So let's turn carving night into a real experiment: which pumpkin seeds will sprout, and can you predict it ahead of time?
What your kids will learn
Grades K–5
- A pumpkin is a fruit, and its job is to protect and carry seeds
- What a seed needs to sprout: water, warmth and air
- The plant life cycle: seed, sprout, plant, flower, fruit, and back to seed
- Counting, sorting and recording observations with drawings
Grades 6–12
- Writing a testable hypothesis and identifying variables
- Calculating a germination rate (sprouted ÷ planted × 100)
- Open-pollinated (heirloom) versus hybrid seeds, and why some saved seeds don't grow "true to type"
- Seed saving and why genetic diversity matters in agriculture
This week's activity: The pumpkin seed float-and-sprout test
- Scoop and soak. Put the seeds and pulp in a big bowl of water and swish gently. Skim off the floating seeds into one cup. Then fish out any seeds that stayed at the bottom into a second cup.
- Make a prediction. Ask: will floaters or sinkers sprout better? Have kids write their guess down before going further. That's their hypothesis.
- Rinse and count. Rinse both groups and count out 10 seeds from each.
- Set up the test. Lay each group of 10 on its own damp (not dripping) paper towel, fold it over, and slide it into a labeled zip-top bag. Keep both bags in the same warm spot. Only the seed group should be different; that's a fair test.
- Check daily. Open the bags each day and look for the first tiny root. Record the day each seed sprouts.
- Do the math. After about 10 days, count the sprouts. Younger kids can make a tally chart; older kids calculate the germination rate for each group and decide whether their hypothesis held up.
A good discussion question: many carving pumpkins are hybrids, so even if their seeds sprout, the plants they grow may not look like the parent pumpkin. Heirloom (open-pollinated) seeds are different: saved seeds grow plants much like the parent, generation after generation. That's why gardeners save heirloom seeds. (Arkansas has frost ahead, so keep this experiment indoors and save outdoor pumpkin planting for after the last spring frost.)
Take it further: a whole garden of seeds to compare
Once your kids see one seed sprout, they'll want to try more. Our Heirloom Vegetable Seed Science Collection is our most popular kit, and it gives them 30 heirloom vegetable varieties to sort, compare and germinate, including Sugar Pie Pumpkins, Hales Best Cantaloupe, Bantam Sweet Corn and Roma Tomatoes.
- In the box: 30 individually packaged heirloom varieties (approximately 5,000 non-GMO, open-pollinated seeds), germination supplies and printed instructions
- Curriculum included: 5 lessons for K–5 or 6 lessons for 6–12 (you choose at checkout), covering plant families, heredity, germination trials and seed saving; emailed after purchase
- Worksheets included: seed comparison and sorting sheet, germination trial data chart, and a life cycle diagram or lab report template
Want a smaller first step? The Heirloom Tomato Seed Germination Science Kit includes 20 assorted heirloom tomato seeds and germination paper. Tomato seeds typically sprout in 3–10 days, and kids can transplant the seedlings into soil to keep the study going indoors this winter.
Join the growing community
Every kit purchase includes an invitation to Aardvark's Seed Planting For Little Hands, our private group for families using our kits. Post your float-versus-sink results, show off first sprouts and swap tips with young growers across Arkansas, West Virginia, Arizona and beyond. We'd love to see whose pumpkin seeds win.
Ready to grow?
Save those seeds this weekend, run the test, and keep the momentum going with a season's worth of hands-on plant science.
- Heirloom Vegetable Seed Science Collection – 30 Varieties, 5,000+ Seeds, with Curriculum & Worksheets: $85.95
- Heirloom Tomato Seed Germination Science Kit – Plant Biology Curriculum & Worksheets: $25.00
