Day 36: I have the impression that I went too far with the fertiliser: next time (on day 38, I think) I will only give water and see how the plant reacts.
Day 38: the plant is reacting well to the fertiliser, although the tips of some leaves look a little burnt: watered with 1.5 litres of distilled water only.
Day 41: watered with 2.5 l water + Plagron Alga Grow + Plagron Alga Bloom + Plant Succes Orca.
Spring weather and temperatures have finally arrived: the plant has had an incredible growth spurt. I certainly won't have a monstrous harvest, but I am confident that I will get there.
@CanuckTaughtMe,
thanks for the vote of confidence, but I don't think I'm a good example: it's the first time I've reached the fourth week of cultivation and I'm making a lot of mistakes...