Mānuka Enterprise · Years 7–8 · 60–70 min
Lesson 1: The Mānuka Plant — Rongoā & UMF Science
Everything the rest of this unit sells, brands and exports starts with one shrub that most people walk past. Today students learn to recognise it, and why one chemical in its nectar turned scrub into an industry.
Te Whakatakotoranga | Run of show
Tirohanga Whānui | What this lesson is doing
Mānuka was called scrub for a century — cleared, burned, treated as what grew back when farming failed. The same plant now underwrites an export industry. Nothing about the plant changed; what changed was knowing what was in it.
That is the unit's opening argument, and it is an economics argument disguised as botany: value is not a property of a thing, it is a property of what people know and can prove about a thing. Students meet both knowledge systems that make the claim — rongoā, which knew mānuka healed, and the laboratory, which can say by how much.
You'll need
- Mānuka and kānuka cuttings if you can get them — a local nursery, a park ranger, or a walk to the nearest scrub edge. This lesson is much better with the real plants.
- Photographs of both if you cannot: leaves, flowers and seed capsules, close up.
- A jar of UMF-graded mānuka honey with the label visible, and any other honey for contrast.
Do Now — What is this worth? 8 min
What it is: An opener that sets up the unit's central economic idea before any botany.
Run it
- Show the jar (1 min): hold up the graded mānuka honey. Ask students to write down what they think it costs. Take the range — it is usually wide.
- Show a photo of mānuka scrub (2 min): "This is where it comes from. For most of the last century farmers paid to have this cleared off their land."
- Pair discussion (4 min): "The plant did not change. What changed?" Answers cluster around demand, knowledge and proof. All three are correct and all three come back in Lessons 3, 4 and 5.
- Bank the question (1 min): write on the board and leave it up all unit — Where does value come from?
Act 1 — Mānuka or kānuka? 15 min
What it is: A hands-on identification task. Two plants that look alike to a casual glance, one of which is the entire industry.
Run it
- Teach the mnemonic (2 min): mānuka is prickly, kānuka is kind. Mānuka leaves are stiff and sharp to a closed hand; kānuka leaves are soft. It is a touch test, not a sight test, and it works.
- Students test and record (8 min): in pairs, with samples or photographs, complete the table. Do not tell them which is which — let the features decide it.
| Feature | Mānuka Leptospermum scoparium | Kānuka Kunzea ericoides |
|---|---|---|
| Leaves in a closed hand | stiff, prickly | soft |
| Flower size | larger, usually single | smaller, in clusters |
| Seed capsules | woody, stay on the plant | smaller, fall sooner |
| Which did our sample match? | ______ | ______ |
- The commercial consequence (5 min): ask what happens to a beekeeper who puts hives beside the wrong shrub. Both produce honey; only one produces mānuka honey. Land this: an identification error here is a business failure later, which is why the industry pays for testing rather than trusting the eye.
Kaiako note: both plants are native and both matter ecologically — kānuka is not the inferior one, it is the one that is not commercially graded. Worth saying, so students do not leave thinking one plant is worthless.
Act 2 — Nectar to grade 15 min
What it is: Students build the causal chain from a compound in the flower to a number on a jar.
Run it
- Give the chain in pieces, out of order (3 min): write these on the board scrambled — bees collect the nectar · mānuka nectar contains DHA (dihydroxyacetone) · honey is graded and labelled · DHA converts to methylglyoxal (MGO) as the honey matures · MGO is what makes mānuka honey different from other honey.
- Pairs order the chain (5 min) and write it into their books as a flow.
- Read the actual label (5 min): pass the jar round. Find the UMF or MGO number. Ask what the number is measuring — the answer is a quantity of a compound, not a quality judgement, and that distinction is the point.
- The trap question (2 min): "Does a higher number mean it tastes better?" No. It means more MGO. Price tracks the number; taste does not have to. Students find this genuinely surprising and it is a clean example of what a market actually prices.
Do not overstate the health claims. MGO has measurable antibacterial activity in laboratory conditions. What that means for a person eating honey is a separate and much more contested question. Model the distinction rather than skipping it — students will meet exactly this gap between "a lab measured something" and "therefore it works" for the rest of their lives.
Act 3 — Two ways of knowing 15 min
What it is: Students compare how rongoā and laboratory science each establish that mānuka works, and what each can and cannot show.
Run it
- Set the frame (3 min): mānuka was used in rongoā Māori long before anyone had heard of methylglyoxal — for wounds, for skin, in kaurapa and infusions, with knowledge of which part of the plant and when to take it held by those trained to use it.
- Fill the comparison in pairs (8 min):
| Rongoā | Laboratory test | |
|---|---|---|
| How is the knowledge held? | ______ | ______ |
| How is it passed on? | ______ | ______ |
| What can it tell you that the other cannot? | ______ | ______ |
| Who is allowed to use it? | ______ | ______ |
- Discussion (4 min): "The lab can tell you how much MGO is in a jar. What can rongoā tell you that the lab cannot?" Answers usually reach relationship to place, the right time to harvest, who holds the right to use it, and obligation to the plant.
Before you teach the rongoā content
Rongoā is a living practice with kaitiaki, not a historical curiosity. Teach it as knowledge that is held and governed, not as folklore that science later confirmed. If you have a relationship with local rongoā practitioners or your kura's kaiwhakaruruhau, ask what is appropriate to share about mānuka in your rohe — practice differs, and some knowledge is not for a general classroom. "I asked, and this part is not ours to teach" is a good thing for students to hear.
Synthesise — Where did the value come from? 8 min
Run it
- Return to the board question (2 min): Where does value come from?
- Each student writes one sentence (4 min) naming what made mānuka valuable, using at least two of: the plant, the knowledge, the proof, the demand.
- Take three (2 min). The strongest answers involve more than one.
Hands forward to Lesson 2: none of this happens without the bee. Tomorrow students meet the part of the supply chain that cannot be manufactured.
Exit ticket 4 min
On a slip:
- The test I would use to tell mānuka from kānuka, in one sentence.
- What the number on a mānuka honey jar actually measures.
- One thing rongoā knows about mānuka that a laboratory test does not.
Reading these: question 2 is the diagnostic. "How good it is" means the lesson's central distinction did not land; "how much MGO is in it" means it did.
Ngā Huarahi Ako | Differentiation
Tautoko / Support
- Give the ordering chain in Act 2 with the first and last steps already placed.
- Pair the touch test with a labelled photograph so the student can check themselves.
- Accept the exit ticket spoken.
Toitoi / Extension
- Find out what UMF actually certifies and who runs the certification. Is it the government, an industry body, or a company? That answer matters in Lesson 5.
- Two jars, same brand, different UMF numbers, very different prices. Work out the price per unit of MGO. Is the expensive one proportionally better value?
Te reo Māori
- Kupu: mānuka · kānuka · rongoā (traditional healing) · kaitiaki · miere (honey).
- Use the plant names as names, not translations — they have no English equivalent in use.
Mātauranga Māori | Rongoā is governed knowledge
The temptation in a lesson like this is to present rongoā as the intuition that science later proved right. That framing makes the laboratory the judge and rongoā the witness, which is both wrong and disrespectful.
Rongoā is a system with its own standards of evidence, its own training, and its own rules about who may practise and what may be shared. It answers questions the MGO test cannot ask — when to harvest, from which stand, with what obligation to the plant afterwards. Teach the two as different systems answering different questions about the same plant.
Hononga Marautanga | Curriculum
New Zealand has a large array of natural resources including fertile land for farming, forests for wood, fish stocks, and minerals.
Te Mātaiaho (2025) · Social Sciences · Phase 3 · Economic Activity · statement id 51119
Mānuka is the case that complicates the statement productively. It was on the land the whole time and was not counted as a resource — it was cleared as scrub. Students finish the lesson able to say what has to be added to a natural thing before an economy treats it as a resource, which is the question the rest of the unit answers.
Sources and checking
- Species identification: New Zealand Plant Conservation Network and Manaaki Whenua Landcare Research both publish mānuka and kānuka pages with photographs. The touch test is standard field practice.
- UMF and MGO: the UMF Honey Association publishes what its grading certifies. Read it with the class in the Lesson 5 extension — who certifies a standard is itself part of this unit.
- No price or export figures are quoted in this lesson on purpose. They move every season. If your class wants them, get them live from Stats NZ or MPI on the day.