wim

Thank you for the feedback.

What is "Sul-Po-Mag" and "Green Sand" (I'm not from the US) ?

I tried the compost from the city. While it's not free, at $ 8.50 per trailer or $ 3.50 per cubic meter if taken by truckload, it was worth a try. I found impurities like expanded clay grains and small pebbles and stones, but also glass pieces. While I didn't care about the expanded clay and stones, I don't like the idea of putting glass sherds into my garden. I'm still looking for a good (cheap and pure) compost source.

I read about adding peat and lime to the soil. What do banana trees prefer; an acid, neutral or basic soil ?

How deep should I mix the soil with organic matter ? Is it true to plant the corm 1 foot deep to protect if from frost and from being blown out of the ground during heavy wind? If so, that would mean I'd have to put organic matter at least 2 feet deep.

Besides of gravel and drainage, are there other things I can do to prepare the soil?

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With kind regards
Wim