Welcome Amanda Streets to Learning to Grow in Florida! I was introduced to Amanda through our passion to compost. It’s an unique basis for a meeting, but sometimes that’s all you need. Amanda runs Pinellas Community Compost Coalition and Living Roots Eco Design. She and I are collaborating to teach composting to the general public in a workshop designed by Grow Permaculture. Please join us along with the other gardening workshops. Enjoy Amanda’s article on the importance of growing your shade!
Unfortunately, I just had to have a gigantic oak tree removed from the south side of my yard. Before removal, we happily gardened and lounged barefoot in the backyard all day long – in the shade of said tree. Now, the ground burns our feet and the sun scorches our skin. My hammock, once graced for an afternoon cat nap daily, is now in my laundry room. Hot, hot, hot. I can’t wait for my small but fast growing fruit tree to cast enough shade to sit beneath.
The increase in sunlight wasn’t a surprise. I understand the basic physics of sunshine and shade. What shocked me was the increased temperature. I couldn’t imagine in my wildest dreams that the thermometer would soar to almost 20 degrees hotter.
How Do Trees Keep the Cool?
A tree is a living organism. It has the same basic needs as a human – air, water, food, and shelter. It just meets these needs a bit differently. Instead of breathing with lungs, a tree transpires. Water vapor is released into the atmosphere from their leaves. As a result, the surrounding air is cooled. Shade below, water vapor above… it’s an air cooling double whammy!
This cooled air is wonderful over a hammock or playground, but what about over the roads? The pavement gets hot enough to cook an egg! And it stays hot. I dread having to wrestle my toddler in and out of the car seat in a hot parking lot. It’s no wonder that I pray for a big oak tree to park under. A shaded surface can be 20-45*F cooler than an unshaded surface. That’s a huge difference!
Want to Lower Your AC Bill?
Trees should be planted on the south, west and east sides of your home for maximum cooling. Unless you have a tree or structure, you won’t ever have shade on the south side of your house. The sun’s rays are strongest in the afternoon from the west, and the east morning sun streams into your windows to heat the house up early. You want to plant your trees near enough to your home to shade the house, patio and yard, but far enough away to avoid roots damaging the foundation. Consider the location of underground utility lines, too. Leave a few feet of space between your home and shrubs to allow for airflow. Larger trees will cast more shade, smaller trees and large shrubs will cast less. Bamboo is also an option, but please buy it from a reputable vendor to avoid the bane of running bamboo. The clumping variety is preferred so it doesn’t take over the neighborhood.
In addition to trees, vines on trellises or pergolas will grow quickly and cast shade. In Florida, you shouldn’t allow vines to grow on your house; it can damage the exterior and lead to other problems down the road. Low growing groundcover plants rather than rock or concrete can cool the ground up to 10 degrees. I have a small concrete patio with rocks next to it and have noticed this area is super toasty. I think I’ll swap the rocks out for a native groundcover that doesn’t need to be mown and put a tall potted plant nearby to shade the patio. Between the two, I’m sure to see a temperature drop.
Make a Game Plan
With a thoughtful arrangement of trees, shrubs and groundcovers, you can really lower the temperature of your yard, home and surroundings. Imagine if all of your neighbors did the same – cooler street, cooler breezes! It’d be an oasis in this subtropical sauna of a Florida summer we’ve been having.