My son is doing a demonstration later this week before his second-grade class, about how to plant peas. For this event, other students in his class are supposed to have materials to work with, to follow along as he instructs them. The materials needed for the project are peas, sticks for the peas to grow up along, soil, and cups for the soil to go into.
I was considering using peat pots for the cups, but one of the steps in the process my son is demonstrating is to water the newly planted pea seed. I know that peat pots can fall apart easily when soaked with water, and with young, clumsy hands, that fragility could result in a big mess in the classroom. Besides that, peat pots are often made from material cut out of peat bogs, ruining a rich natural ecosystem that cannot quickly restore itself.
I was relieved, therefore, when I saw that our local grocery store is selling compostable cups made from polylactic acid resin (PLA) derived from corn rather than from petroleum. They’re made in the USA, which is a plus for both labor and environmental reasons, So, I felt pretty good about getting these cups as an alternative to fragile peat and all-too enduring traditional plastic cups.
Then I got home, and looked for more information at the web site of the company that makes the cups, Fabri-Kal. Their domain name, f-k.com, seems itself quite ready to degrade into something quite biological…
Anyway, I looked into the company’s “greenware”, hoping to find more good information about the environmental qualities of these cups. Instead, I found an asterisk next to the word “compostable”. It turns out that these cups are “compostable where managed facilities exist”.
Managed facilities, it turns out, are municipal or industrial composting plants. “Due to the variability in conditions, home composting of Greenware products is not recommended by Fabri-Kal,” reads a disclaimer. The cups will degrade into carbon and water within 50 days, but only when composted in conditions of 150 degrees F at 90 percent relative humidity.
Yikes. I don’t think that my compost pile reaches that temperature or level of humidity. So, have I been tricked?
I’m not sure. It’s possible that the cups will biodegrade, though at a slower pace, at a lower temperature and humidity. Perhaps the warning to not consider the cups compostable in home garden conditions merely exists to protect the Fabri-Kal company from impatient customers who expect to be able to compost 100 of these cups in a few weeks in their back yards. We don’t have a municipal composting facility in my village, but nearby cities have them, and in those areas, these cups could be easily disposed of without adding to landfills.
Fabri-Kal is to be commended for offering a more environmentally-friendly cup, even if their cups aren’t absolutely ideal. These cups are a better choice than peat or traditional plastic, and I appreciate that.
Before I make my final judgment of these cups, I’m going to put some in my own backyard compost pile – a relatively new one that I don’t expect to have truly ripe for two years to come. If the cups biodegrade there in that time, I’ll consider them to have fulfilled their promise of compostability.
I’ll write an update on the condition of the cups in a few months, and again when that compost pile is finished with its work in a couple of years.