Auto flowers

4 weeks and no nutes!! Have you got soil with nutrients in? What medium are you using? Your diary is a little sketchy so it's hard to answer so I'll give alternates: If you have soil with nutrients in then it looks like like they may be depleting and you will have to add more. 2 it's not charged soil or is Coco then start adding some . You then need to decide on organic or synthetic. I found when I started that Coco was the best and I still think that. A good cheap synthetic nutrient line up would be something like maxi crop. This is power and is used throughout the grow. Another is canna a&b with pk13/14. Enough for your grow won't cost more than £20. This is liquid. You can buy bottle after bottle but for someone newish the canna range is good. You say you are new but you have a year old diary. If in Coco then I recommend some calmag. This is maybe what you need along with a base npk, either a separate grow and bloom or just full grow. Again this is synthetic. If you need more assistance then drop me a DM and keep asking questions. The internet has everything there is to know so study like hell