To explain a plant choice, link the plant to the site, the purpose of the space and the upkeep it needs. A plan that only lists names shows memory, not understanding.
This lesson belongs to the wider SPM subjects and learning resources section. After it, read how to interpret a nursery growth-observation table, which uses observation to check whether a choice worked.
What does an explanation of plant selection include?
It answers three questions. Can this plant live here, what job does it do here, and can the owner keep it healthy?
If any one of these is missing, the choice is only half explained. A shade tree planted where it blocks a walkway solves one problem and creates another.
A four-column habit: site, purpose, plant, reason
Before you write a paragraph, fill in a small table. It stops you from jumping straight to plant names.
Worked example: a school corner plan
Here is an original plan. A school wants to improve a rectangular corner beside the canteen. The corner gets strong afternoon sun, the soil is sandy and drains quickly, and students walk along one long edge.
| Site fact | Purpose | Plant choice | Reason |
|---|---|---|---|
| Strong afternoon sun on the west side | Shade for benches | A medium-sized shade tree at the west end | Gives cover where the heat is strongest, and its canopy will not reach the roof if planted away from the wall |
| Sandy, fast-draining soil | Low water use | Drought-tolerant shrubs in the middle bed | They cope with dry soil, so watering can be kept light |
| Students walk along the long edge | Clear and safe path | Low groundcover along the edge | Stays below knee height, so sight lines stay open |
The layout follows the same logic: tall plants at the back and west end, medium plants in the middle, low plants at the front beside the path. Each position has a reason that comes from the table.
A common mistake: naming without explaining
A weak answer says: “I chose a tree, shrubs and groundcover to make the area nice.” It names the layers but gives no link to sun, soil or people.
A stronger answer keeps the same plants and adds the link: “I put the tree at the west end because the afternoon sun is strongest there, and I chose groundcover along the path so that students can see ahead.”
Watch the word “because”. If your sentence has no “because” or equivalent, the explanation is probably missing.
Layout and maintenance
Spacing is also part of a good explanation. Plants placed too close compete for light and water, while plants placed too far apart leave bare soil that dries out and invites weeds.
Think about upkeep at the same time. A hedge needs regular trimming, while a groundcover bed may need weeding in the first weeks until it fills in. State who will look after each area and how often, using your school’s actual arrangements.
Check yourself
The same corner now has a damp patch beside a drain, where water collects after rain. A classmate wants to plant the same drought-tolerant shrubs there. Explain in two sentences why that choice should change.
Answer
Drought-tolerant shrubs are chosen for dry, fast-draining soil, and a damp patch is the opposite condition, so their roots may rot in standing water.
The patch should get plants that cope with wet soil, or the drainage should be improved first, so the plant matches the site fact and not the earlier plan.
What to study next
Good plans are checked against what actually happens. Continue with interpreting an original nursery growth-observation table, then use the structured-answer self-review tool to test your written explanations.
For a teacher to go through your plan sketches with you, see online one-to-one Landscape and Nursery tuition. Practical site work stays with your school.