How do I know the seedlings are going to be bio-active?

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Collecting samples of Leptospermum scoparium in coastal region of Southern Victoria October 2015

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Populations of Leptospermum should be  tested during flowering at least at a reconnaissance level to ensure that there is bioactivity in the plants and to establish an approximate average DHA level. More detailed testing will allow for the identification of individual plants that have a higher than average DHA from which selections can be made. This is discussed in the next section.