Science Fair

Grown-ups

Top 10 science fair projects about plants and weather

Every project on this list is one of Peabody's own, free, with the hypothesis, steps, results table and board plan on its page. The only living things in them are plants.

How it's ordered: The growing-and-weather projects, the longest-running first, because a day-by-day logbook is what makes them shine.

The ten projects

  1. ☕ Which kitchen scrap helps a plant grow most? (ours): 4th–8th grade · 21 days of testing · about $3. Plants take water and minerals from soil, and they make their own food from light.
  2. 🧂 Does salty or sugary water change a bean plant? (ours): 4th–8th grade · 14 days of testing · about $2. A plant's roots pull in water, and the water carries minerals the plant needs.
  3. 🌱 Do grass roots stop soil washing away? (ours): 4th–8th grade · 14 days of testing · about $3. Roots grow through the soil and hold it together like a net, so water can't lift the soil grains away so easily.
  4. 🌿 Does grass grow best under red, blue or green light? (ours): 4th–8th grade · 14 days of testing · about $3. Plants make their food from light, and green leaves soak up red and blue light best and bounce much of the green away, which is why they look green.
  5. 🎨 Which paper colour fades fastest in the sun? (ours): 2nd–6th grade · 14 days of testing · free. The colour in paper comes from dyes that soak up some colours of light and bounce back others.
  6. 🥔 Do potatoes sprout faster in the light or dark? (ours): 2nd–6th grade · 14 days of testing · free. A potato is a plant's food store, packed so new shoots can grow from its eyes.
  7. 🪴 Do crowded seeds grow shorter? (ours): 4th–8th grade · 14 days of testing · about $2. Plants in the same cup share one lot of soil, water and light, so each one gets a smaller share.
  8. 🌱 Does planting a seed deeper make it slower to come up? (ours): 3rd–8th grade · 14 days of testing · about $1. A bean carries a packed lunch, the food stored in its two halves, to feed the shoot until it reaches light.
  9. 🌱 Do beans grow best in soil, sand or cotton? (ours): 2nd–6th grade · 14 days of testing · about $3. Roots need water, air and something to hold onto.
  10. 🌱 Do plants bend toward the window? (ours): 1st–5th grade · 12 days of testing · free. Plants grow toward light because light is how they make their food.

👨‍👩‍👧 For grown-ups and teachers: how much to help, the safety rules, and running a school fair. Science fair v0.16.1 · Checked .

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