A good mix should support your plants roots & drain well. Since, we don't know the exact make up of your store bought soil. Make a one gallon test pot first, before mixing up everything. Casue after you do, you can't unmix it.
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Try - 1 part soil, 1 part compost, 1 part pertilite, & 1 part peat moss - mix it up good, put it in your little one gallon test pot & pour one quart of water into it. Wait 5 minutes (for the mix to absorb this water). I suggest you smoke at least one joint, while waiting. Tests always made me nervious - so I consider this test preparation. LOL... Then pour one more quart of water into the pot.
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If the 2nd quart drips out, but does not run out - your there. If it runs out, mix in more peat moss. Just repeat until - it drips & does not run. Cause you want it to hold some water / nutes, plus drain to ensure your roots get oxygen. If it hold like a sponge it's to thick.
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After, you find your balance, slip in a cup of worm castings per gallon of soil to round it out.
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Hope this helps...
Keep it Real...Organic...
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