Biology
Lavender and conditions for different varieties
Author
Cécile Bardel, Charles Baudelaire
Target Group
16-17 years old students
Brief Description
Lavender and conditions for different varieties

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LAVENDER AND CONDITIONS FOR DIFFERENT VARIETIES 

Topic handout (1/2)

Resources

The three main varieties of lavender native to France

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Essential oil yield

(growing in a full field)

Strong

(15kg / hectare)

Very Strong

(1000kg / hectare)
Weak
Required climate
Dry chalky environment
Chalky environment, very dry
Chalky environment, very dry


Step 1: Plan an experiment to help to resolve the problem (10 minutes maximum)
Come up with a feasible experiment which would allow you to check if the new grower’s variety is adapted to being grown in dry conditions and if it could be beneficial in perfumes.





LAVENDER AND CONDITIONS FOR DIFFERENT VARIETIES 

Topic handout (2/2)

Step 2: Carry out the experiment to obtain exploitable data
Carry out the experiment using the microscope and lavender cutting to determine if the new grower’s variety is adapted to being grown in dry conditions and if it could be beneficial in perfumes.
Step 3: Process the data and present your findings

In the form of your choice, process and present the raw data so that you have the necessary information to respond to the problem. 


Step 4: Used the obtained results to respond to the problem and answer the question
Process the results to determine if the new grower’s variety is adapted to being grown in dry conditions and if it could be beneficial in perfumes.





LAVENDER AND CONDITIONS FOR DIFFERENT VARIETIES 

Experiment Protocol Handout


Equipment available and protocol for using the equipment

Supplementary information: the secretive system of Lamiaceae

Thyme, mint, and lavender all possess small spherical structures which produce essential oils called secretory glands. Recent studies have shown that the production of essential oil would also be a reaction by the plant to dryness or drought.

(Source: Laboratoire BVPAM, Université de St Etienne)

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Secretory glands and trichomes or “hairs” form a protective padding against drought. 

Organic material:

-       A leafy branch of common lavendar

-       A leafy branch of the new type of lavender grown by the new grower

 

Lab Equipment :

-       stopwatch, gloves

-       surgical knife

-       surgical pliers

-       magnifying glass, felt-tip pen

-       green iodine solution (highlighting, thanks to the colour contrast, the essential oils and epidermal cells)

-       distilled water

-       dropper

-       lames, lamelles

  -    optical microscope

In order to show if the new grower’s variety is adapted to being grown in dry conditions and if it could be beneficial in perfumes

 

For each variety of lavender:

 

§  Place a lavender leave between the two slides; take off the cover slide to make some fine horizontal cuts with a surgical knife.

§  Place the cuttings in green iodine solution for a minute, then rinse in distilled water.

§  Put the cuttings between the microscope and cover slide in a drop of water.

§  Look for the presence of secretory structures (glands) and protective structures (hairs/bristles).

Health and safety

No risk linked to the use of green iodine

Handling precautionsy424P8DSPKj6G2T57IAAAAASUVORK5CYII=

Treat the cuttings from different varieties seperately and ensure they are kept separate, using individual slides for each variety.




LAVENDER AND CONDITIONS FOR DIFFERENT VARIETIES 

Handout for the teacher


Material per student:

-       Organic material: two leafy branches of two types of lavender:

* common lavender or Lavandula angustifolia OR lavandin, to be identified by its normal name

* another lavander (lavandin ou lavande fine OR Broadleaved lavender Lavandula latifolia OR topped lavender Lavandula stoecha...) to be identified as the “new variety of lavender”

-       stopwatch, gloves

-       surgical knife, surgical pliers

-       magnifying glasses, permanent marker

-       Solution of 1% green iodine, distilled water, dropper

-       microscope slide, cover slide

-       two microscopes






LAVENDER AND CONDITIONS FOR DIFFERENT VARIETIES 

Microscope observation microscopique to be done

New species / New varieties

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Related files

expected result for the experiment 208 KB
Lavender and conditions for different varieties 420 KB
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