A long-term observation project. The child plants a bean against the clear wall of a jar and watches it sprout, root, and grow over 1–3 weeks, drawing the change on the same page in the same notebook every few days. It’s the classic “see what’s underground” experiment.
- Soak 3–4 dried beans (pinto, lima, mung, or fava — not raw red kidney, which is mildly toxic raw) in water overnight. Choose plump, uncracked ones.
- Line the inside of a clear jar (glass for adult-handled, sturdy plastic for the child) with a damp paper towel pressed against the wall. Tuck the soaked beans between the towel and the glass, so they’re visible from outside, about a third of the way down.
- Add 1–2 cm of water at the bottom of the jar — enough to keep the towel damp but not enough to drown the beans.
- Place the jar in a bright spot (windowsill, but not in direct hot sun all day).
- Open the Sprout Journal — a folded paper booklet or fresh page in the child’s nature journal. Day 0: child draws what the jar looks like and writes (or dictates) one sentence: “Today the bean is…”
- Every 2 days (Mon/Wed/Fri), the child draws what they see and writes one observation. Mark the height of the tallest sprout with a sticker on the outside of the jar. Refresh the water if the towel is dry.
- After ~2 weeks, when the seedling is too big for the jar, plant it outside or in a pot of soil — and keep tracking.
Variation: comparison jars — one with water, one without; one in the dark closet, one in the light. Or race jars — three different kinds of beans, which sprouts first? Or upside-down jar — turn the jar 90° once the root has grown; does the root reorient downward (gravitropism)?
Requirements
- Space: A windowsill or bright shelf; later a small pot of soil if planting on
- Surface: Any flat windowsill or shelf; protect wood from water with a saucer or coaster
- Materials: A clear jar (glass or sturdy plastic), 3–4 dried beans (soaked overnight, **not raw red kidney**), paper towels, water, a folded paper Sprout Journal, pencil and crayons, optional small ruler, optional pot of soil for transplant
- Participants: 1 adult + 1 child for setup; child observes independently after
- Supervision: Light to moderate — adult handles glass and any water-pouring; child does the daily looking and drawing
Rationale & Objective
Bean-in-a-jar germination is the canonical preschool life-science project (NAEYC Spotlight on Young Children: Exploring Science; Worth & Grollman; Ashbrook NSTA Early Years). NGSS K-LS1-1 (“use observations to describe patterns of what plants and animals need to survive”) is a direct match. Long-duration observation projects (1–3 weeks) build executive-function persistence, time concepts, and life-cycle vocabulary that brief experiments cannot (Helm & Katz; Carolan 2016). The repeated return to the same jar — same place, same paper, same routine — is what produces the “I can see it changed!” moment. It also gives the child a real, slow, living thing to be responsible for, which builds care and patience.
Progress Indicators
- Early: looks once or twice and forgets; drawings are unrelated to what’s actually visible; doesn’t connect water with growth
- Developing: looks every couple of days with reminders; drawings show the bean’s general position but not the new structures (root, shoot); names “bean” and “water” but not “root” or “sprout”
- Proficient: returns to the jar voluntarily; drawings show progressive features (root growing down, shoot growing up, leaves unfolding); uses life-cycle vocabulary; predicts what tomorrow will look like
- Advanced: notices the gravitropism (“the root goes down even though the bean is sideways”); designs a comparison (“what if mine has no light?”); writes one-sentence captions independently; transplants and tracks the plant outdoors for weeks more
Safety Notes
- Choking: dried (un-soaked) beans are a choking hazard for under-4s and a real risk if the child mouths them. Soak before bringing within reach
- Toxicity: raw red kidney beans contain phytohaemagglutinin and are toxic if eaten raw. Use pinto, lima, mung, or fava and never let the child eat raw beans
- Glass jar: shatter risk if dropped — a sturdy clear plastic jar is safer at age 5; place glass jars in a spot the child can see but not pull from
- Mold: damp paper towels grow mold within a week. If mold appears, do not let the child sniff up close; ventilate the jar; refresh the towel and water; if mold returns, end the project early
- Wash hands after every handling (bean dust + soil)
- Watch for water on windowsills — wet wood warps and stains
- If bean dies: do not throw out silently — talk about it as data (“why might it have died?”)
Hints
- Playfulness: name the bean (“Beanie,” “Sprout,” “Mr. Green”). Take a daily “check-in selfie” with the jar — kids love the time-lapse of their own face next to the growing plant
- Sustain interest: start three jars on three different days so something is at a different growth stage each time the child checks in. Keep a wall photo of each day’s drawing — the time-lapse is genuinely magical to a 5-year-old
- Common mistake: replacing the bean if it doesn’t sprout immediately — robs the child of the comparison. Watering too much (bean rots) — use a spray, not a pour. Drawing only at the end — the weekly drawings are the developmental gold; without them, the child can’t perceive the rate of change
- Limited space: a single jar on a windowsill needs almost no room. The drawings can live on the back of an envelope. The whole project costs under $1
- Cross-domain: measure the height with a strip of paper marked each visit (numeracy and tools); name parts (root, stem, leaf — vocabulary); compare two jars (classification); illustrate the life cycle (graphic representation); count days since planting (calendar)
- Progression: one jar, daily look → one jar, every-2-days drawing → 2 jars (water vs no water) → 2 jars (light vs dark) → seed-to-pot transplant tracked for a season → grow a second crop from the seeds of the first
Sources
- NAEYC (2013). *Spotlight on Young Children: Exploring Science*
- Worth, K. & Grollman, S. (2003). *Worms, Shadows, and Whirlpools*. Heinemann / NAEYC
- Helm, J. H. & Katz, L. G. (2016). *Young Investigators: The Project Approach in the Early Years* (3rd ed.). Teachers College Press
- Carolan, P. L. (2016). "Early Childhood Nature Journaling Sparks Wonder." International Journal of Early Childhood Environmental Education (ERIC EJ1108035)
- Ashbrook, P. (NSTA *Science and Children* — "The Early Years" column on plant growth and observation over time)
- NGSS K-LS1-1 (plants and animals' needs)
- HighScope KDIs — Observing, Drawing conclusions, Communicating ideas, Natural and physical world
- Head Start ELOF — Scientific Reasoning (P-SCI 1, 5)
- Teaching Strategies GOLD Objective 24 (scientific inquiry), Objective 25 (living things)
- UK EYFS — Understanding the World (The Natural World ELG — processes and changes in the natural world)