Square Foot Gardening Forum
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Post  sarahmitzie on 5/27/2014, 5:22 pm

Does the vermiculite need to be horticultural grade because i've seen some at a much reduced price but it is advertised for building.
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Post  rabbithutch on 5/27/2014, 6:04 pm

I don't think there is any difference except price.  Vermiculite is a mineral product.  By saying that it is horticultural grade, the seller gets to add a price premium.

I might be wrong.  I sold vermiculite about 55 years ago to the building trade.  It looked exactly like the stuff I bought for my MM.

I hope someone with more knowledge than I will chime in.
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Post  Goosegirl on 5/27/2014, 10:42 pm

I get mine in the insulation department at Menard's. It is the same stuff.

GG
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Post  camprn on 5/28/2014, 6:59 am

For more info check the vermiculite sub forum.

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Post  PVPind on 5/28/2014, 9:05 am

It depends on the manufacturer. Some vermiculite's and perlite's also are treated with dust inhibitors and water repellent additives for the building industry. I am not familiar with European manufacturers. I would suggest you contact them directly.
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Post  plantoid on 5/30/2014, 6:06 pm

@sarahmitzie wrote:Does the vermiculite need to be horticultural grade because i've seen some at a much reduced price but it is advertised for building.




Hello Sarah ,
Welcome to WSF .
 I've  lived  at the west end of the M4 motorway in South Wales  for the last 8 years ... played in the construction & telecoms industry a while prior to that .
I converted over to the All new square foot gardening & Mel's mix about four years ago from his original mother earth idea.
 
My ANSFG beds are fantastic producers .. some of the photo's are in the gallery in  " BIG STUFF "

Construction grade coarse or medium vermiculite insulation granules is fine for making Mel's mix .


Last year I got mine from Keyline builders merchants ...one in most large cities/ towns  ( former T&P , Travis Perkins and several other buy outs of late ) for £22 + VAT for 100 litre bags with free delivery for the ten I purchased .



If your making small pencil holes in peat to sow plug type seedlings ( It works very well as it helps keep the moisture level around the seeds fairly constant .) pop some 2 to 3 mm graded horticultural vermiculite ( £7 ish for 2 kg ??? ) in the bottom of the 2/3 of the hole pop in the seed and sprinkle a covering layer of the small stuff over then gently water .

Tip.

 I have purchased one of the cheapie £1.50 3/4 litre green plant plastic watering cans out of Aldi .
 Slipped a 400 mm x 10 mm bore  length of high quality soft silicone rubber tube  over the spout , on the other end of th tube I have unscrewed a dead biro pen and inserted the threaded end of the barrel in the tube. 
I can now accurately water from above in a very tiny low pressure stream all over a block of four seed trays ( 93 mini seed tubes )  without disturbing seeds, vermiculite or the seed labels .
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