When should I start feeding with nutrients? I am ...

you should still be fine for the 4 weeks. the root system isn't going to reach enough of the soil to drain it all that quickly. Say you had a pot that east going to be filled with established flowers with heavier root systems, then the nutrients in the soil will be used very quickly. For a cannabis plant, with one plant in the pot I would suggest that you will be fine for nutrients till around the suggested time.

It's hard to tell really, since each system is different. 11 liters of soil (even dilluted) should last at least 3 to 4 weeks. My advice to you is to give ut water only until you see the first signs of deficiency and then start feeding

Yes week 3-4 like you mentioned would be ideal. I've always tried to find ways to push my autos in the first weeks and in fact its counter-productive. They only need very little at first. You can push your PPMs once your plant has grown and more robust. So first 3 weeks let the plant grow use up whatever nutrients in the soil and at week 3 slowly introduce 300ppms to your plants. Good luck!

Hi @Jmanc! When you grow an autoflowering strain you don't know yet, it is always a good idea to be very careful about the nutrient intakes. Recovering from overfeeding is harder than solving an slight deficiency. With a good soil your plant should be able to find everything she needs for a few weeks. You will probably need to watch her during the pre-flowering stretch, since this phenomenon requires more Nitrogen for a few days. In this situation I wouldn't give her anything but root-stimulator (always helpful during the first weeks) and see how it goes after a few weeks. If the bottom leaves start to turn yellow or if the upper new growth are showing spots, then give her a good meal with adjusted pH and EC. Hope this will help, keep us up-to-date and happy growing! 👊

Hi there mate looking good I think if your only using water at the moment then that should be ok for 2 weeks along with your soil nutes. Then I would begin feeding aith whatever you are using but at a half strength You will know whether your plants are lacking nutrients if they are a paler green Hope this helps mate 👍

I would shoot for the 4 weeks myself, seedling are to young to be give nutes to. There should be loads of nutes in your soil. Check everyday and if you see deficiency then start your feed. When you feed start low and work your way up I start at 1/4 see how she reacts then work my way up from there to full strength. When you do start feeding watch for leaf tip burns that will indicate to much feed! Always start low