Four Pots on One Windowsill

Four pots stand on one windowsill. Each begins with three seeds, so the project starts with twelve. By Day 12, ten shoots are visible above the compost. Two positions have no visible shoot. The notebook contains a small success, some uncertainty and enough numbers to make a careless conclusion look convincing.

This is an original fictional teaching project. No plants were grown, photographed or measured to produce its results. Every case number is invented for arithmetic and interpretation, not offered as an experimental finding, germination guarantee or account of personal experience. The conceptual cover is not a photograph of the case.

The project follows seedlings rather than products, people or medical treatments. Its question is deliberately small: what can a record of emergence, visible height and position tell us about these twelve seed positions over twelve days? A separate question, why the plants differ, requires more than a tidy list of heights.

You can read the entire book without sowing anything. The worked example is complete on paper. If you later choose to observe real plants, use suitable identified seeds, appropriate space and the current instructions for that plant. The fictional density, timetable and numbers are not a universal cultivation plan.

The notebook will help us keep three things separate: what a plant does, what an observer records and what a conclusion claims. The separation is not a reason to stop being curious. It gives curiosity somewhere precise to go.

University of Minnesota's seed-physiology chapter describes stored reserves supporting early growth and the roles of water, oxygen, temperature and sometimes light. [S2]

That short biological background changes how we read the first days. A seed does not become interesting only when something appears above the surface. Our chosen record, however, may not show everything happening out of sight. A visible-shoot count is a particular observation, not an inventory of every process in the pot.

In the fictional project, the observer does not dig up the two positions without shoots to obtain a satisfying answer. Their condition is unknown at the end of the observation period. The record can say not visible above the compost on Day 12. It cannot say dead, permanently failed or never began to develop.

Species and conditions matter. This book sets no single temperature, soaking method, sowing depth or emergence deadline for all seeds. A reader should not turn the case's twelfth day into a biological rule. The date gives the example a stopping point, not nature a timetable.

Write your observation boundary before you begin. If you plan to record only what is visible without disturbing the plant, say so. The boundary makes the record less ambitious and more usable. Another investigation may legitimately ask a different question with an appropriate method.

The first lesson of the pots is therefore a botanical one: the living subject and the part visible to a casual observer are not the same thing. The notebook should name the part it actually records.

RHS indoor-sowing guidance directs readers to seed-specific requirements and suitable containers, labels, growing medium and watering arrangements. [S1]

For a real observation, prepare ordinary plant care before designing an impressive comparison. Use clean, suitable containers with existing drainage and a stable tray. Choose a safe location where pots will not fall or spill onto electrical equipment. Follow the plant and product instructions; do not copy a fictional pot size or seed spacing as a recommendation.

RHS safety guidance recommends gloves for handling soil or compost, careful dust handling and washing hands after gardening. [S7]

This book involves no chemical mixtures, fertiliser trial, mould culture, heated apparatus or electrical modification. Do not eat the project seeds, shoots or growing medium. Keep materials away from young children and pets; a child observing plants needs an appropriate adult. If the practical setup does not suit your circumstances, work with the paper case instead.

The fictional observer labels pots A, B, C and D, with three seed positions in each. A and B occupy one part of the sill; C and D occupy another. All receive ordinary care. These positions were not randomly assigned, and light, temperature and moisture were not instrumentally controlled. The case is an observation exercise, not a rigorous light-treatment experiment.

That limitation is part of the plan, not a surprise hidden at the end. You can learn to keep a useful notebook without claiming your home has become a controlled laboratory. The appropriate ambition is to leave a readable record and identify the next question honestly.

University of Minnesota's roots chapter describes anchorage and absorption of water and dissolved nutrients. [S3]

The visible shoot therefore belongs to a living system, much of which this notebook does not inspect. We do not pull seedlings straight to simplify a measurement or excavate roots merely to improve the illustration. The chosen record can remain above the surface while acknowledging what it does not examine.

Each position has a stable identifier: A1, A2, A3; B1, B2, B3; C1, C2, C3; D1, D2, D3. The identifier belongs to the position, not to a ranking. If A2 becomes taller than A3, their names do not swap. Otherwise a series of measurements could silently describe different plants on different days.

Draw a simple location sketch on the first notebook page. If a pot must be moved for ordinary care, record the move and restore or update the sketch accurately. Do not hide a change merely because the comparison looked neater before it happened.

In a real project, record the identified plant, seed packet or batch reference and sowing date. Do not publish someone's address or a photograph containing personal papers. A useful plant record does not require a public record of the household.

Identity is an ordinary practical detail with a scientific consequence: a number becomes interpretable when another reader knows which thing was observed. Twelve numbers without that connection are not automatically twelve well-described observations.

The fictional notebook defines visible height as the vertical distance from the local compost surface to the highest visible point of that seedling, recorded in millimetres. It is not the length of a curved stem, root length, total plant mass or a complete measure of health.

The observer places a ruler beside the shoot without pressing it into the plant or stretching the stem. The reference surface and viewing direction are kept as consistent as practical. One centimetre equals ten millimetres; the worked data use millimetres throughout. A unit change must be converted, not silently mixed into the same column.

If the plant leans, vertical height can change differently from stem length. That does not make the observation useless. It means the label matters. A notebook measuring one quantity should not conclude as though it measured another.

The ruler in this example is read to whole millimetres. The record does not acquire tenth-millimetre precision because a calculator prints decimal places. Nor does keeping the same ruler certify that the whole method has been professionally calibrated. Describe the tool and the practical limitations without inventing a laboratory certificate.

Choose a consistent observation time where possible and record the actual time. If you miss it, note the difference instead of backdating the entry. Leaves and shoots can change position; a photograph from a different angle is not automatically a second measurement of the same defined quantity.

The result is a modest operational definition. Someone else can understand what the number was meant to represent, even when they cannot recover every condition under which it was read.