October 13, 2024: Anthocyanin

It sounds scary, but anthocyanin is what produces the red and crimson foliage that makes New Hampshire famous this time of year.  

Red Maples are the red champions of the autumn nature show.

Yellow and orange colors in leaves are present year-round but are only revealed in the fall when the leaves stop producing the chlorophyll that conceals their underlying colors. 

Photosynthesis ceases at the leaf tips first and works back towards the stem.

Trees with red leaves, however, actually create the pigment anthocyanin as they shut down photosynthesis in the fall.  They don't do it for our viewing pleasure or to extend the tourist season, but rather because the chemical helps protect plants against cold temperatures.

Black gum are less prevalent than maples but have even deeper red color in their leaves.

They use some of the sugars created over the summer to form this compound.  Anthocyanin is produced by a wide variety of plants with red, blue, and purple coloring including blueberries, tomatoes, red cabbage, beets, grapes, corn, even sweet potato.  It's one of several chemicals in the flavonoid family which are known to have antioxidant and anti-inflammatory benefits to humans.

Indian Cucumber has only a splash of anthocyanin.  The berries aren't edible, but the tubers are.

The color of these plants varies because anthocyanin changes color with pH level:  it is red in acidic conditions, purple in neutral, and yellow in alkaline conditions.  The chemical is thus useful in measuring pH levels - remember pH strips in high school chemistry?  Wikipedia provides lots of information on anthocyanin if you're interesed in learning more.

Jack-in-the-pulpit berries must be quite acidic.

Sumac is another red star this time of year.

Blueberry bushes are known to love acidic soil, and their leaves also turn dark red in the fall.

These were at 2400' elevation on the ledges up to Black Mountiain.

Black Mountain State Forest is in Haverhill and Benton, NH, and though the foliage there seemed past peak that far north on Friday, it was still pretty.

Thank you TB for the recommendation - it was a great hike!  

Around the Lakes Region, the maples are still at peak color.  I'll end with a few sights from around Lake Wicwas.

It's not too lake to take it all in!