Trichocereus ...?

[Cactinsane]

Equal parts Sieved Compost, Sand & Pumice is a good mix.
Or just 50/50 Potting soil and perlite.
With a pinch of bone meal. No full sun

[widea]

After more than a month (June 19th) it has grown more fat and changed color (probably the effect of putting it outside):

Before (May 3rd, inside):


Regards,

Cor

[Cactinsane]

Noice

Looks very Bridgesii...