Day 37: watered with water only (1.5 l): from the appearance of the plant I deduce that I overdid the fertiliser two days ago.
Day 41: watered with 1,5 l water + Plant Succes Orca + Plagron Alga Bloom.
The plant clearly made me realise my fertilisation error of last week, I corrected it and she has started to grow well again. However, the low temperatures and rainy days have caused her to remain small: by now she has entered the flowering phase, I fear she will not grow much more.