Hi
@gianrico! Well my guess is that you may have a poor airflow, your plant needs a slight continuous breeze to cool them down and grow quickly. This could also come from a dry environment, the current heatwaves in Europe are coming from Morocco and are really dry (we can even have some sand in the air). I see your plants did grow pretty well during the last weeks, you should see flowers soon. By this time you should stop foliar feeding and go back to regular waterings, because you don't want the buds to be in contact with fertilizers. Hope this will help, keep us up-to-date and happy growing! 👊