Sapwood
/ˈsæpwʊd/
Definition 1 of 1
Pro Tip 1/3Growth Indicator
The width of sapwood rings can indicate a tree's age and growth conditions. 
A tree with wider sapwood rings likely had favorable growing conditions.
Pro Tip 2/3Color Contrast
When referring to sapwood, note the contrast between the lighter sapwood and darker heartwood. 
You can see the boundary where the pale sapwood meets the dark heartwood.
Pro Tip 3/3Active Function
Emphasize sapwood's role in transporting water and nutrients compared to the inactive heartwood. 
The sapwood is crucial for the tree's nutrient transportation system.