2026–27 · Backup lesson · Winter 2027
Choose the Right Sowing Depth
Adult extension of: How Deep Does a Seed Go?
Unscheduled alternative · available resource
Use seed-packet directions and a depth guide to sow a usable container of seeds. Compare a recommended-depth planting with a clearly labeled deeper trial, then follow emergence over time rather than judging success on planting day.
Curriculum skill focus: Fine-motor control, depth concepts, comparison, functional planting
01 · Learning
Objectives
- Find the sowing depth for one named crop on its packet.
- Use a marked tool to make a planting hole at the selected depth.
- Record emergence and distinguish a prediction from an observed result.
02 · Preparation
Materials
Untreated seeds of one suitable crop; original seed packet; clean pots with drainage and trays; fresh seed-starting mix; scoop; ruler; blunt plant marker; removable depth mark; labels; gentle watering bottle; observation sheet.
03 · Practice
Adult project
- 1
Select a crop you would actually like to grow. Read or listen to its packet directions together, including whether it needs covering or surface sowing, and choose a sowing, measuring, labeling, or observation role.
- 2
Use the ruler to mark the recommended depth on a blunt plant marker. Test the mark against the ruler, and practice making a hole in a spare section of mix without forcing your fingers into the soil.
- 3
Fill two matching containers with the same mix. Label one recommended depth and one deeper trial, state the measured depth for each, and predict which seeds might emerge first; do not plant the whole crop at an unsuitable depth.
- 4
Sow equal numbers of the same seed in each container at the labeled depths. Cover as directed and water gently with the same measured amount, keeping both containers in the same suitable conditions.
- 5
Make a dated starting record with a sketch, photo, spoken note, or tally. Schedule checks within the packet’s emergence range, recording visible sprouts and moisture rather than digging up seeds to see whether they are working.
- 6
Compare the emergence records when the observation period ends. Choose the packet-recommended method for the next practical sowing, discuss any unexpected result without treating a tiny trial as proof, and clean the work surface.
Evidence & interpretation
What the investigation shows
Sowing depth depends on species, seed size, and light requirements; a universal depth rule is unreliable. Germination and emergence also depend on moisture, oxygen, temperature, and seed viability, so a short comparison does not isolate every cause.
Practical connection
Why this work matters
Planting to a crop’s instructions supports reliable seed starting and reduces wasted seed and repeat work.
Participation by choice
Individual access options
- Direct a partner to the depth mark using speech, pointing, eye gaze, or AAC while they make the hole.
- Choose large seeds and an adapted scoop, or select a premeasured depth guide instead of reading small ruler divisions.
- Keep hands clean by handling labels or reviewing close-up photos; decline soil contact or take a break without losing the decision-making role.
Review & transfer
Reflect on the work
- What instruction helped you choose the depth?
- What would count as evidence that the two depths affected emergence?