Seeding Media

Circle-M-Farm

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The information below is from the book " The Complete Book Of Growing Plants From Seed" by Elda Haring. I thought it may help some of the amateurs and novalis alike.

Vermiculite

This is a form of expanded mica with a tremendous capacity for holding moisture. It can be used with excellent results. The agriculture grade used for seed starting is the one known as "Terralite" the granules are relatively small and the product dust free. Some gardeners find that it is inclined to hold too much moisture and I agree that it can be tricky to control.

Milled Sphagnum

Finely milled sphagnum moss has been used for starting seedlings for a good many years. Used alone, in most cases, it gives excellent results. Many of our gardening friends use this medium alone for starting plants and find it most highly suitable. However, in our experience we find it has a tendency to "cake" or "crust," especially when used for seeds which need a long period for germination. We have had some of the more vigorous seedlings come up with a cruston the seedling leaves, appearing as though they were wearing straw mandarin hats!

Perlite

Perlite, a volcanic ash, when used alone has one or two qualities which we don't like. It stays quite cool or even chilly, which might possibly be good for those seeds which need to be kept cool for germination but not so for those which need warmth. It does not absorb moisture but rather holds the moisture around each little granule and it has a tendency to float and disturb the seed bed, which we find objectionable.

Equal Parts Of Vermiculite, Milled Sphagnum And Perlite

Our personal preference for starting seeds is a mixture of a three of these in which the composite mix seems to result in a blend of the advantages of all three, without there faults. We feel this is the perfect mix. It is light, clean and easy to handle. It holds moisture but readily drains. For those gardeners who have not been absolutely satisfied with the seed medium they have been using I can recommend this mixture whole-heartedly. Since we have been using vermiculite and/ or this mix, hard seeds like those of lupine and morning glory which authorities assert must be soaked or nicked prior to sowing have for us germinated readily in three or four days. Seedlings in this mix, may, if necessary be fed with a liquid fertilizer to keep them healthy and strong. For this purpose we use either Rapid-Gro, Miracle-Gro, Hyponex or Plant Marvel, diluted to one-fourth strength when the seedlings are very small, increasing the strength to one-half that recommended on the package and feeding weekly until they are either transplanted to flats or placed directly from seed pan to the garden.

Vermiculite
vermiculite.jpg


Perlite
perlite a.jpg

Milled Sphagnum Moss
Milled-Sphagnum-600.jpg

 
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digitS'

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We just have to continue to pay attention to people asking and help them in their search for good information, NyBoy :)!

These are organic choices for potting mixes, altho some seed starting is mentioned. National Center for Appropriate Technology (NCAT) I like to use the
Cornell Cooperative Extension's "Vegetable transplant recipe" with

Equal parts by volume of:
  • compost
  • peat moss
  • perlite or vermiculite
for up-potting of plant starts, once they are 8 weeks old, or so. If they are staying in a container for the season, or seasons, it seems a good choice and lower cost.

Steve
 

Circle-M-Farm

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Cornell mixes are used by a lot of manufactures, one being Pro-Mix.
One Pro-Mix formula used/ uses 11 parts (by volume) peat, 5.5 (by volume) vermiculite and 5.5 (by volume) perlite then they used/ use a
"Base mix fertilizers" that is a mixture of ground limestone, superphosphate, calcium or potassium nitrate, Iron sulfate, fritted trace elements and a wetting agent. I myself used this formula (11-5.5-5.5) for may years until I started tinkering with it and came up with a mixture/s that I like.
 

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