On Friday 9 August I grew it and I feel very happy with the result, this is how it looks now! The sun hours are more less the same as in the South of Spain in Summer, I do not control it at all but more less I think 10-11 hours. See you next week mates I hope it will improve a lot this week :)
The plant stem is very weak and the plant does not stand up. I have added substrate to the pot to decrease the size of the stem and it can keep in pi by itself. Will the roots raise and use the new substrate, or in that area no roots will develop?
Yes the stem will start sprouting roots where you buried it so they will use that space. It usually takes about 2 weeks but she will grow new roots right out of the sides of the stem.