15/03/2026
🌿 Japanese Maple: Colour Changes and Understanding Senescence
When people admire the autumn colours of Japanese maples, what they are witnessing is a natural biological process called senescence.
What exactly does this mean?
👉 leaves changing colour
👉 partial leaf drop
👉 growth slowing down
But that explanation is only half the story.
🍂 In Temperate Climates (North Asia, Europe, North America - US & Canada)
Japanese maples are grown in regions with distinct seasons.
As temperture falls and daylight hours shorten, the tree begins preparing for winter.
During this period:
• Chlorophyll break down in the leaves
• Hidden pigments appear — Anthocyanin (Red, Purple, Pink), Carotenoid (Orange, Yellow, Gold)
• Nutrients are withdrawn from the leaves back into the branches, trunk, and roots, storing energy for the next cycle
• Leaf drop signals readiness for dormancy
This is a cold-temperature-driven survival process.
This is why autumn foliage becomes so vivid before the leaves eventually fall.
By recovering nutrients before winter, the tree conserves energy to support next spring’s growth.
🍂 Late Autumn → Dormancy
As senescence completes:
• Leaves dry and detach
• The canopy becomes bare
• Growth activity slows dramatically
The tree then enters winter dormancy, resting until warmer temperatures signal the next growth cycle.
🍁 Why This Matters
Understanding senescence helps explain why autumn colour is not random.
It reflects a tree that is healthy, responsive to seasonal signals, and preparing for renewal.
🌿 In tropical climates like Singapore, where winter does not occur, this process behaves differently — something we explore in our earlier posts.
🍁 Acer Folia
Refined nature. Grown with understanding.
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