Rooting a melocactus matanzanas cutting???

[Russell99]

Ok, so the problem now is how do I pot it. The roots are in the crater. If I just put it and fill it up there would be a hallow center. Here's how I potting it( mix is inorganic to prevent mold(fungi) growth)

Chose a appropriate pot and fill it with a layer or grit to increase drainage.

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Now fill it using the appropriate soil you want ( 40 grit 60 sand(not dust))

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Now here comes the problem: the hallow center. I read somewhere to use a clay based soil and fill in the crater, I feared that this could cause it to solidify like a cement once it dries up or cause rot. So using the mix I made a small sand mount

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simple as that, now place your melocactus on top of it like this

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start filling the sides and when doing so tap the sides of the pot to allow the mix to settle down.

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. Now let's call it a day after giving it a good watering

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Those spines look really good when wet .