BioBiz All-Mix / Seedling Soil

Hey!

I have asked this before a while ago, but did not really get an answer so I need to find out for sure now.

I have a big bag of BioBiz AllMix, but it says that there is 1L of Ferts in it (in the 20L bag). I bought All-Mix since I thought I can use it for all, as in, seedling and grow, but a plant I planted in this mix died- and I think it could be due to the soil, so I now need to find out what I actually need to get.

So, I know that iv not to give plants any nutes until 3/4th set of true leaves- at which point I will transplant the plant into the All Mix soil.

Can anyone please tell me what kind of soil/mix I should buy (via internet-no garden shops near, also im in UK) to start out a young seedling?

Preferably it would be a pre mixed soil- to save me buying 10L bags of different things and then taking a tiny bit from each to fill a pot or two.

Thanks in advance!,

Also, what is the use for Jiffy Plug's? They dont seem big enough to grow the plant until its mature enough for nutes.

Is this what Im looking for?, Pre Mix Soil?

Quote:

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BioBizz Pre Mix

This mixture of organic fertilisers was developed especially for organic cultivation. You can use it to create your own mixture of potting soil at low costs, or to make your potting soil reusable indefinitely.

Pre-Mix combines the qualities of many different organic fertilisers, rock meals, trace elements and fungi in such quantities that optimum growth, flowering and maximum resistance to disease and fungus are guaranteed.

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