Why Biological Garden Products Shouldn’t Come in Plastic.
Updated: 4 days ago
Have you ever noticed how many biological garden products come in plastic containers?
It feels like a strange contradiction once you really think about it.
You’re buying something specifically to put life back into your soil. Fungi, bacteria and other organisms that help the soil system function.
And then it arrives in packaging that can persist in the environment for decades or longer.
If the whole point is to improve the health of the soil, I think it’s fair to ask whether the packaging should be part of that conversation too.
We shouldn’t be trying to solve one environmental problem while quietly contributing to another.
Where the microplastics actually come from
This is something most people never think to look for, because most people never get the chance to look at compost under a microscope.
I do.
Over the years I’ve looked at soil and compost from home gardens, farms and larger composting systems, and I’ve genuinely seen pieces of plastic in the material.
Once you start looking closely, it becomes hard to ignore.
Research into composting systems has found a similar pattern.
Systems using cleaner, source-separated organic waste tend to produce compost with less plastic contamination, while larger facilities processing more mixed household biowaste can carry more.
The reason is fairly straightforward.
The more plastic that enters with the original material, the harder it becomes to remove every piece before the finished compost reaches the soil.
That doesn’t mean every council or commercial compost is heavily contaminated. Different facilities use very different systems and feedstocks.
But it does mean that what goes into a composting system matters.
A home or farm compost pile gives you much more control over that.
You know what went into it.
Does compostable packaging actually break down?
This is where things get a little more complicated.
“Commercially compostable” is a real and meaningful term, but it doesn’t mean something will necessarily disappear in an ordinary backyard compost bin.
Commercial composting facilities operate under controlled conditions, including sustained heat, moisture and aeration. A typical passive home compost pile often doesn’t reach those conditions consistently.
But a properly managed hot compost pile is different.
If the carbon-to-nitrogen balance is right, the pile is large enough, moisture is controlled and it is turned regularly, temperatures can rise high enough to overlap with the lower end of commercial composting conditions.
So I don’t think the honest answer is:
“Home compost can never break compostable packaging down.”
It’s more accurate to say:
Most passive home compost systems probably won’t provide the conditions required.
A properly managed hot compost system may be a different proposition.
And even then, the certification on the packaging matters.
Something labelled commercially compostable is not automatically the same thing as something certified for home composting.
Why this matters for what you put on your soil
Every bottle, bag and container we use has an end-of-life story. Some materials can break down under the right conditions, whilst others persist for a very long time and may gradually fragment into smaller pieces.
If you care enough about your soil to think about biology, structure, nutrients and water, I think it makes sense to think about the packaging around the products you’re using too.
Not because one container is going to save the planet. But because the decisions we make at scale matter.
That thinking is why I didn’t want RootWise Balance packaged in conventional plastic.
It comes in cardboard and tin, with a commercial compostable liner in between.
The packaging wasn’t an afterthought.
It was part of the product.
Because if I’m asking people to put beneficial biology back into their soil, I want the packaging around it to reflect the same thinking.
Biology back into the soil. Packaging that can break down.
John
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