The full title was "Don't Call it Dirt, Don't Call it Trash." The explanation says, "This garden embodies the transformation of materials considered garbage... into recycled glass sand, biochar and compost."
I'll start with the one we are all familiar with- compost. "Food waste is combined with oxygen, water and microbes to break down scraps and make food waste compost." It talks about how much food waste is landfilled, and how Philadelphia now has a commercial composting business that is focused on reclaiming this resource to make rich soil.
They showed some of this soil, nicely decorated with some glass ornaments and garden plants
The glass is an important part of this exhibit, and one that I was a bit surprised at. I was vaguely aware of this use, but this educated me a lot more.
"Glass waste is crushed and seived to make glass sand." The explanation touches on a topic that is hot news in West Michigan- sand mining. It says that sand is an important component of engineered soil blends, and it is one of the most heavily extracted materials on the planet. Sources of construction-grade sand are running out, and there are increasing environmental concerns. (those of us near Ludington have sure heard about that in recent years!) Meanwhile, the US landfills 7 million tons of glass every year. Two businesses in Philadelphia are working to create sand from waste glass.
The display featured glass sand in several colors. I'm sure that for commercial use they don't pay much attention to color, but this was attractive.
I didn't know much at all about the third part of this exhibit. This is about biochar. "Wood waste is chipped and heated without oxygen to make biochar." OK, this is also how they used to make coke to smelt iron. Now I began to understand. This oven/kiln at Marquette along the NCT is one such structure. They would fill it tightly with wood, start it burning, seal it up to reduce the air and let it smoulder until the wood had all turned to charcoal/coke (both are high-carbon fuels mostly differentiated by various cantaminants they contain). This is the kiln at Marquette.

Then it is ground up. OK, so biochar can be used as a soil amendment. Reducing the amount of wood waste that is simply burned in the ordinary manner reduces the amount of carbon dioxide released into the atmosphere. That burning without much oxygen sequesters the carbon in the charred wood.
This is pure biochar. In actual use, it would be mixed with other soil components.
The exhibit also had some art made from recycled glass that I thought was cute.
The rest of the display featured nice plantings and more garden ornaments made of recycled glass.
I think that showcasing products and technologies like this are an important part of the Flower Show. Some displays I remember from other years are things like capturing rainwater, green roofs, urban gardens to reduce city temperatures, etc.
In other news, I was really tired today. Probably because yesterday was the first vendor event I've tried to do since being sick. I managed to do a few things, and walked 2 road miles with 15 pounds in my pack and an elevation change of 90 feet.
Miles hiked in 2025: 81.
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