A bean, a jar, a bit of damp kitchen roll. Everyone does this one. Most people do it badly, and the child comes away having learned that beans grow, which they knew already.
Done properly it teaches something harder and much more useful: that a plant is a machine with parts, and that you can watch the parts arrive in order.
The setup, with the bits people skip
Soak the bean overnight first. This is the step everyone skips and it costs you three days of nothing happening. A dry bean is dormant; a soaked bean has already started.
Use a glass jar, kitchen roll crumpled in the middle to hold the bean against the glass, water in the bottom - about a centimetre, not more. The bean sits between the paper and the glass, where you can see it. Somewhere warm, not on a sunny windowsill, which cooks it.
Set up three, not one. One will fail, or go mouldy, or do nothing, and a child whose only bean died has learned nothing except that science is disappointing. Three also introduces the idea that you don't conclude anything from a single result.
What actually happens, in order
This is the part worth knowing in advance, because it tells you what to point at:
- Days 1–2: the seed coat splits. Nothing dramatic, but it's the first thing to look for.
- Days 2–4: the root comes out first, and it goes down - no matter which way up you put the bean. Worth turning one jar upside down on day four purely to watch the root turn round and head down again.
- Days 4–7: the shoot comes up, bent over like a hook, pulling itself out rather than pushing.
- Days 7–10: the first two leaves open. These are the seed leaves - they were folded up inside the bean the whole time.
- Days 10–14: the bean itself shrivels. It's been the food supply, and now the leaves have taken over.
That last point is the one children remember. The bean isn't the plant's container; it's the plant's lunch, and you can watch the lunch being eaten.
The daily question
Thirty seconds a day, same question every time: what's different from yesterday?
Not "how is it going." Not a paragraph. One drawing the size of a stamp, and one line. On most days the answer is "nothing" - write that down too. Days when nothing happens are data, and a fortnight of entries where four of them say "nothing" is a far more honest record than a tidy story of constant growth.
Three questions worth asking
- Why does the root come out before the shoot? Because water matters more urgently than light.
- How does the root know which way is down? Nobody expects a child to answer this. The point is that it's a real question with a real answer, and that plants are doing something rather than just sitting there.
- What is the bean for? Ask on day two and again on day twelve. The answer changes, and the child will notice that it changed.
If it goes wrong
Mould usually means too much water. Nothing happening after five days usually means too cold, or the bean was old - supermarket dried beans work, but not all of them are alive. Start another three and don't make a ceremony of the failure.
Where this comes from
The seeds unit in Volume Three runs this as a two-week bean diary, with a page per day already laid out - a box for the drawing, a line for the observation, so the format never has to be invented at eight in the morning.