These things were on my mind as I drove to a Master Naturalist class about Tree Biology. Geek alert... I learned some fascinating things about what makes a tree a tree, how trees grow, and how they survive winters. Here are a few snippets:
- The height a tree can grow is based on many factors including genetics (think of the differences in two dog breeds for example - a dachshund will never be as tall as a lab), environment (the amount of space and competition for light), and a tree's ability to move water through its system (pressure system from roots to leaves).
- In order to survive winter, trees begin a process of acclimation. In Minnesota, this usually begins in mid-July when light decreases and trees stop growing to prepare for winter. The growth process ceases and next year's buds are set at the ends of branches.
- Want to help your trees survive winter? Water them in the fall. Roots are not as cold hardy as the rest of the tree. At 15 degrees Fahrenheit, roots can die. If you water well into the fall, that water around the roots will freeze at 32 degrees and surround the roots. A thick layer of snow will act as an insulator.
- Palm "trees" aren't really trees and are more closely related to grass. Heart of palm, a vegetable that many people enjoy, is the single growing bud of the palm. Harvesting it kills the palm.
- Trees do not grow from ground level up, but from the top. So if the lower-most branch is five feet from the ground, and the tree continues to grow taller, the lower-most branch will still be five feet from the ground in ten years.
- A gingko tree is biologically a conifer whose fruit is a fleshy (and stinky!) cone.
- A burl on a tree is caused by bacteria or fungus that get into a tree and cause the tree to create a lot of bud tissue in one spot. The fungus or acteria then feeds on that tissue.
- City boulevard trees tend to grow bigger and faster than park trees, possibly because when rainwater hits hardscape (sidewalks, parking lots), it flows across that hardscape to the soil where trees are planted. Trees get all that water and have less competition.
One final bit that I found fascinating and can't stop thinking about... The molecular structures of hemoglobin and chlorophyll are incredibly similar. Hemoglobin moves oxygen through our blood, and chlorophyll, through photosynthesis, helps a tree absorb light and transfer energy through the tree. Both are crucial in getting nutrients through systems, human and tree. Hemoglobin, with iron at the center, gives us red blood. Chlorophyll, with magnesium at the center, gives trees green leaves.
That got me thinking about my love for trees and the emotional connections I feel. When I look at trees, especially trees in winter that have lost their leaves, I often imagine human forms.
Darwin, of course, saw a myriad of connections. He used a tree as metaphor in his theory of evolution to show the relationships among organisms. His tree of life looked like this:
I am a big believer in the interconnectedness of everything. So when I take classes to learn more about particular subjects, I think about how that knowledge enriches my life. Today I'm considering connections with my preschoolers and their play (their cognitive, physical, and emotional development) on and around trees. Here is one of the many trees of life I see in my work:
- Trees become magical places of dramatic play. Children make forts, they play house, they turn a tree stump into a throne, they become characters in imaginary play, try out new roles, and experiment with their own power.
- Trees provide ample opportunities for physical challenges and growth. Moving your body across a fallen tree trunk implores a child to take risks, learn balance, improve strength, and deal with different heights.
- Sticks. I could write a book on stick play. Many adults shy away from allowing children to play with sticks because of the potential danger. Yes, sticks can cause injuries. The tips can be sharp. Play can turn aggressive (think swords and light sabers). But I've learned not to assume that a stick is being used as a weapon. Sometimes they're being used as tools (drill, lever, walking stick, measuring stick). Often when I ask children what their stick is, I find out it's a magic wand, a giant pencil, a unicorn horn. Even play with sticks as "weapons" is ok with me as long as we've set some ground rules: You have to ask the other child if they want to play a fighting game. You have to keep enough space between your bodies so the sticks don't actually touch (use your voice for sound effects). The stick has to be a length you can control (waist high at most). You have to be in a space where others aren't going to get hit when you swing your stick. This allows children to play out those good versus evil games that they love, in a way that minimizes risk.
- Trees are places for scientific inquiry. Think of all the things you can discover by turning over a log, or comparing different kinds of leaves, or watching squirrels chase each other around the trunk of a tree. Children are mesmerized by all of the life in and around trees. They learn so much by observing insects, worms, mushrooms, and birds. They notice details. They ask a ton of questions. They are motivated to find out more.
- Then there is the solace of being in wild places. Yes, wild places exist even in urban spaces. Even at the nature center where I work, we can see and hear cars, airplanes, and other signs of our proximity to urban life. That is one of the incredible gifts of trees. I think of the boulevard trees I played near as a child. I could completely tune out the street noise and transport myself to another place in my mind. Children do this all the time. I often see a child sitting beneath a tree, lying across a log, staring up into the sky. They look so peaceful, so calm, so happy. That is what trees can do for us, even as adults, when we take the time beneath a tree to just be.
Go ahead. Take a walk. Find a tree. Give it a hug if you want to. I guarantee it will make your day better.