Indicator Plants and Growth Patterns

• In the UK, the northern hemisphere dictates that north-facing sides of trees, rocks, and hillsides receive the least

  In the UK, you can use trees to find your cardinal directions by observing how they react to the sun and prevailing winds. Look for thicker foliage and wider growth rings on the southern side, a northeastern "combed" lean caused by southwesterly winds, and anchor roots facing southwest. [1, 2, 3, 4]

   

  Key Sun Indicators

   

  • Foliage Density: Trees need sunlight to thrive. In the UK, the southern side of a lone, mature tree (like an oak or Scots pine) will receive the most sun, leading to denser, heavier growth and more asymmetrical branching. [1]
  • Growth Rings: If you examine a cut or fallen tree stump, the growth rings will typically be thicker and more spread out on the southern side, which receives the most light. [1]
  • Bark Texture: The bark on the south side of a tree receives more direct sunlight, causing it to dry out, weather faster, and become harder or more cracked. [1, 2, 3, 4]

   

   

  Wind & Root Indicators

   

  • The "Flagpole" Effect: The UK's prevailing winds blow predominantly from the southwest. On exposed moors or coastlines, the tops and smaller branches of trees will bend and point toward the northeast, acting like a natural weather vane. [1, 2]
  • Anchor Roots: Because the prevailing wind hits from the southwest, mature trees often send out large, sturdy "anchor roots" to the southwest to support themselves and "buttress roots" steeper at the back (northeast). [1, 2]
  • Tree Trunk Shape: Because of the southwest-to-northeast winds, tree trunks will often look 'thinner' or skinnier when viewed from the southwest or northeast and widest when viewed from the southeast or northwest. [1]

   

   

  Understanding Moss

  While moss is famous for "growing on the north side" of trees, survival experts and natural navigators—as detailed on The Natural Navigator—warn that it is not perfectly reliable. Moss thrives wherever there is sustained moisture and shade, not specifically northern exposure. It can be safely used as a secondary clue if you observe it growing in the shaded, damp hollows of a tree protected from the southern sun. [1, 2, 3]