Virtual Museum of Canada
Jardin botanique de Montréal 
Centre for Forest Research

Transcription of video clip A hidden treasure

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Willow budbreak, over the course of two weeks

Schematic of willow budbreak

© Jardin botanique de Montréal
Willow budbreak

The bud opens: it is budbreak.

The first leaves are preformed.

They grow rapidly, since the tree only needs to inflate already created tissues.

 Schematic of twig growth

© Jardin botanique de Montréal
Twig growth

Afterwards, leaves on the twig develop more slowly.

The twig adapts its growth to the resources available in its environment.

In a year, if conditions are right, it can extend up to three metres and bear close to 200 leaves.

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