2026–27 · Backup lesson · Winter 2027
Track a Houseplant’s Response to Light
Adult extension of: Plants Follow Light
Unscheduled alternative · available resource
Investigate how new shoots may bend toward a directional light source using dated observations of a suitable plant. Turn the observations into a practical placement and rotation plan without expecting a plant to move visibly during one session.
Curriculum skill focus: Prediction, cause-and-effect, visual tracking, scientific observation
01 · Learning
Objectives
- Identify the direction of a plant’s main light source.
- Keep a consistent viewing position when recording shoot growth.
- Use several observations to choose a suitable placement or rotation routine.
02 · Preparation
Materials
Two comparable young plants with flexible growing shoots if available; plant-care information; safe window or suitable grow light; pot labels; position tape; ruler; camera or drawing sheet; previously dated growth photographs for discussion.
03 · Practice
Adult project
- 1
Identify the plant and review its light needs. Look at a window-lit shoot or a dated example, then ask whether new growth will stay upright or bend; choose whether to observe, photograph, measure, or handle a pot.
- 2
Place comparable plants in suitable directional light without overheating them. Mark the pot orientation and camera position; if testing rotation, label one unchanged and one planned rotation while keeping care as similar as possible.
- 3
Record a starting image or drawing that includes a vertical reference and the shoot tip. State the predicted direction of new growth, and agree not to interpret an old bent stem as evidence from today’s setup.
- 4
Return on scheduled days and photograph from the same position. Record only visible changes, moisture checks, and any changes in light or care; rotate the designated trial pot only on the planned date.
- 5
Lay out the dated records and trace the shoot tip’s direction. Compare the changed and unchanged pots, or compare one plant with its own starting record if a matched pair was unavailable.
- 6
Choose a practical location and, if useful for this plant, a gentle rotation routine. Label the care plan, restore healthy growing conditions, and identify a question that needs more observations rather than a quick conclusion.
Evidence & interpretation
What the investigation shows
Phototropism is directional growth in response to light, often seen as young shoots growing toward it. Not every species or mature stem responds the same way, and growth typically requires hours or days to observe.
Practical connection
Why this work matters
Understanding directional growth helps position indoor plants and recognize when a plant may need a better light location.
Participation by choice
Individual access options
- Use enlarged before-and-after photographs rather than tracking small changes on the live plant.
- Direct pot placement or label orientation while someone else lifts and turns the container.
- Choose a drawing, tactile direction arrow, spoken description, or AAC response; leave the lighted area or stop handling whenever preferred.
Review & transfer
Reflect on the work
- What changed between the dated images?
- What else besides light direction might affect the shoot’s appearance?