Homemade Potting Soil

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I make potting mix every year for my greenhouse seedlings.  I also make mixes for my mom’s raised garden beds, (at home I grow in the ground and do things a bit differently for that).  I have written about making potting soil many times here & here, but every year I refine it, learn more, change things, or get my hands on something new.

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I gather my materials from my yard and pre- sift everything so I have it ready to make mixes when I want to.  I sift it because little plants need readily available nutrients and fine tilth so their roots have an easy time growing.  Any big chunks sifted out can go back into the landscape under big trees and around perennials.

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Materials

Sifted Compost from your own pile (or another source if not is available)

Sifted Soil from your garden

Sifted Sand from your arroyo

Moistened Coco Peat ( this is the only thing I buy and I get it locally at Agua Fria Nursery)

I get all this stuff in advance and store it in bins so everything is ready to go when I need to mix.

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Once I have everything gathered I get my

wheel burrow,

a 5 gallon bucket,

a shovel and

a hoe.

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Here is my the recipe I use, adapted from my Alma Matar, CASFS.

It is a parts recipe, but if you use a 5 gallon bucket as your measuring cup and follow this recipe you will get a full wheel burrow, which will be enough soil for 10 flats of 2 inch pots or 6 homemade wooden 2x1ft seedling trays.

Mix into wheel burrow

1 Bucket-Shifted Compost

1Bucket- Shifted Garden soil

1 Bucket Coco Peat

This is the base recipe from here you can add all sorts of fancy things if you have them:

Ground up egg shells

Perilite

Moonshine

Grape seeds

Oh there is so many thing you can add to soil mixes and that is really determined by how much money you have, what you are trying to grow.  I keep things pretty simple around here, but have fun with what you decide to add to you soil, (or ask me for more advice!)

Mix everything well with a hoe and sprinkle occasionally with water.

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The moisture level is key, not only does it cut down yucky dust, but you want a nice moist mix in your flat before you seed.

If it is too dry it will actually repel water and you tiny seeds will float away in the run off.

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Give it a squeeze and release

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If it stays in a loose ball and breaks apart when you bounce it in your palm you have got it.  Now store it in a bin with a lid to keep that perfect moisture, or put it directly into you flats and sow away!

And that is that.  Once you have your flats made & potting mix made, now all you have to do is decide what to grow.  Go here if you are ready for the next step!

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Planting into pallets

Is there anything you can’t make out of an old pallet?  Yes, it does take more time and a bit more know-how to upcycle a pallet into a totally different and functional thing, but luckily I have an expert on my side.  Yep, Joel does it again.  This time he made me a new seed planting flat out of recycled pallet wood.

(Note: I do also do make these out new wood too, see here)

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Cool Huh?  Want to try? Here is how he did it.

First, he tore the pallet apart with a flat bar to get the the lumber in order. Image

Then he used the cross pieces which were 3.5inches wide and 1/2 to 3/4 inches thick.  There was mix of oak (harder, longer lasting, heavier) & pine (softer, easier to work with lighter)

 

Then he cut off the split tips with the nails in them- to have clean, split free ends and not to bother with pulling out the nails.Image

Then he cut 2 pieces at 1ft long and 6pieces at 2ft long

He nailed 2 of the 2footers & 2 of 1footers into a rectangular box.  The 2 footer edges over lapped the edges of the 1 footers.  Unfortunately he moved so fast I didn’t get to photograph every step… but I hope you follow.

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Then he nailed the remaining 4 2footers to the bottom of the box using 4d galvanized nails. These are rust resistant and small enough that they will keep the wood from splitting, but large enough to hold your box together when it is full of heavy, wet soil.  Because the wood was irregular enough he just pushed the bottom slats together and nailed…but it is important to note during this step to leave a little space between the slats for water to drain out, but not soil.  I usually stick a quarter between the slats which has always proven to be just right.

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And there you have it.  Here is one I made from Redwood and screws in 2010 (in front) and the new Pallet one (in back).  Image

Similar—-but there are few subtle differences.

*The new one is a bit wider than the other.  As far as size go, I pretty much try to maximize my table space.  If you table is a 3×6 (which many tables are) you can fit 9 2×1 flats on it.  That should be more than enough (much more in fact) for all your seedling needs.  Remembering, when you start seeds in wooden planting flats you will need to divide them or thin them before they reach the garden, so leave space in you table(s) for transplants.  This is basically bio-intensive gardening, but more on that later…here is the next step if you are eager.

*The other difference is that my new flat is mostly oak and the older one is Redwood.  Both have their pros and cons

Oak- Hard, Heavy, Durable,Rot Resistant, Brittle-(Available in Pallets)

Pine- Soft, Not Rot resistant, Light weight, Cheap or free-(Available in Pallets)

Redwood- Light weight, doesn’t spilt easily, VERY Rot Resistant-(Must buy)

Wooden Flats are a great thing to add to your garden shed if you find yourself starting seeds every year.  They are pretty simple to make, relatively cheap and last many years, not to mention they are NOT plastic.  They work beautifully to hold moisture and give ample space for those babies to grow.  Many farms use them, which is where I learned about them.  Here are a few I stumble across while ambling through a sleepy farm in Colorado last spring.

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Yes, I take pictures of other people’s planting flats, I told you I was a farm tourist.

Good Luck and I hope you help rescue one more lonely pallet from the back of your hardware store and put it to good use.

When you are ready here is a link to how to make potting soil for the flats and one on how to plant into them properly.  Let the sowing begin!!