I take advantage of an “organic delivery program” in my city, and I primarily get “living” greens and sprouts, which are things like kale, pea tenders, sunflower sprouts, spinach, etc. with the root ball still in tact, hence the descriptor “living”. The grower is Slegers, you can see the conversation that I had with Jo Slegers near the end of this post.
Anyway, I’ve noticed some “gold flakes” in the dirt ball and decided yesterday to look into what they were. I’ve always just thought that when you want to grow something you dig up some dirt and plant the seed. Clearly there’s much more to it than that. There are pH levels, soil “type”, little critters, compost, hemp.. and so on.. lots to learn when creating “healthy soil”. I trust that organic farmers that grow my food are on top of their game with this stuff, but sometimes things need a little further investigating. And like anything else that should be “natural” there are lots of products out there to “make things easier”, but at what cost?
Apparently these “gold flakes” are vermiculite. From what I understand, it is a mineral, that when heated to extreme temperatures expands like a tiny accordion creating little tiny “pockets”. When used in soil they perform all sorts of functions, such as creating “air” throughout the soil and retaining some water and nutrition for the plants. I might be way off base there so I linked to a Wiki page above.
Well, upon researching, I discovered that the largest production of this mined material contained asbestos and that there are warnings to avoid the use of vermiculite altogether, in all industries! Ugh, just when I thought I was doing right by my family by choosing organic produce! The story doesn’t end so bad though. I contacted Slegers and Jo quickly and kindly responded sharing his experience on the topic. The email thread (unchanged) is presented below (with Jo’s permission).
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On Fri, Nov 9, 2012 at 10:17 PM, Keith Lock wrote:
Hi there,
I buy your greens all the time. My children drink them in smoothies daily. I have a question that I was hoping you could address. I just noticed today about the “gold flakes” vermiculite in the soil. I wanted to show you this ( http://www.carollsmith.com/pdf/EPAwarns.pdf ) and ask for your feedback in regards to the asbestos.
Thanks,
Keith
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On Fri, Nov 9, 2012 at 11:39 PM, Jo Slegers wrote:
Hi, Keith. I read the whole article. Zonolite sounds like a packaging material that would benefit from being moisture resistant. I always understood that Asbestos, especially as an insulation requires great levels of moisture resistence. Formica rock (vermiculite) being a cheap, abundant, lightweight and easy to process mined material would probably lend itself well for asbestos fortifying.
I am speculating that Zenolite and other types in garden centres are always using generic blends to improve bottom lines especially when toxic waste is free. I source my Horticultural grade vermiculite only from my long time suppliers which at this time use the “Holiday”brand which is mined out of northern Ontario and Quebec. These sources also continue to increase in price. The ability of this vermiculite continues to absorb moisture immediately every time I use it every week. In addition, I notice benefits of some mould suppresion. Perhaps this is environmental zoning.
I do ask my suppliers once a year at most on this topic of distinguishing these similar products and they tell me that there is no asbestos present. I cannot at this time prove anything other than observing it’s phsical properties. I guese a lab report may help.
I also think this lady is very reckless in her delivery of this topic and has abused her position. I wish she could have offerred valid intgrity of probable sources of real vermiculite with more work on her end instead of declaring all inadequate.
I use vermiculite to improve germination of seed without rotting or drying up too fast. I find the close ratio of air to moisture ideal. It also decreases the risk of water bourne health risks that are usually prominant with water bathed sprouts. Some of my Micro greens do not require vermiculite. This is because the smaller seed does good on it’s own on my mud dirt. When sprouted, the grow dirt is already starting to dry. I find larger seed more at risk of failure.
Please give me your thoughts and let me know if I need to do more to earn your trust.
Jo Slegers
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On Sat, Nov 10, 2012 at 12:04 AM, Keith Lock wrote:
OK, that’s interesting. I appreciate the response. I do have a couple more questions in relation to the greens. From what it sounds like, if anything at all from the “dirt clump” finds its way into the blender, there is no need for any concern in your opinion? I’m guessing if it’s OK to “grow” in, it won’t hurt if we digested some accidentally?
Also, being that the dirt clump is very damp and it sometimes takes a few days before I get, it ends up in and out of cold environments, is mould a concern? What’s the best way to store it? I usually leave them in the box a few hours and they find their way to the fridge eventually. Starting next week we will be getting 20 or so of them each week and I just want to make certain we are storing them correctly. Do you recommend washing the greens before use? I ask because I can’t help but walk by, rip off some leaves and eat them.
Thanks very much for your time.
Keith
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On Sat, Nov 10, 2012 at 12:24 AM, Jo Slegers wrote:
The dirt clump is harmless and natural. Mould would be a concern if you have enough to make cotton swab. it robs alot of nutrients. Some peoplw are allergic to mould. The best sorage place is in the fridge crisper where there is not a fan dehyrating greens. When cold, the root does not allow water transfer unless it warms up first.
Washing is never wrong only just before eating. I hardly ever do myself.
Jo Slegers
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On Sat, Nov 10, 2012 at 12:30 AM, Keith Lock wrote:
Thanks Jo,
Can I share this email thread as a blog post on my web site RawFoodHealthWatch.com? I will be sure to include a link back to your web site.
Thanks again,
Keith
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Yes. Thank-you for your support.
Jo