12. Attachment 12_Mature_Old_WesternJuniper.pdf
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- Solicitation number
- 12363N25Q4074
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Department of Agriculture Forest Service
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The document is an illustration from the Western Juniper Field Guide showing visual characteristics of western juniper trees at different stages of maturity. The figure compares two images of juniper trees at 75 and 150 years old, highlighting key differences in bark texture and tree structure. At 75 years, the tree has thin and flaky bark with a conical crown shape and pointed tip. By 150 years, the bark layer thickens and begins developing vertical furrows, with the tree's crown becoming more rounded or flattened, and leader growth slowing down. The visual guide helps identify mature western juniper trees over 150 years old based on these distinct morphological changes.
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Figure 5: Visual characteristics for determination of mature western juniper trees greater than 150 years old (taken from Western Juniper Field Guide).
Young or immature trees will have a conical crown shape with a pointed tip, few dead branches, and thin and flaky bark.
Mature trees develop vertical furrows in bark; leader growth is slow, and crowns are rounded or flattened.
(a) At 75 years, bark is thin and flaky.
(b) At 150 years, bark layer is thickening and beginning to develop vertical furrows.
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