Homemade Lemon Pie

Hi! That is just some random weed but not cannabis so just pluck it out. You don't want anymore plants taking the nutes of your plant. OFC plant that small wont bring muvh danger to your grow but still unwanted.

I don't understand why everyone in the US is so obsessed with cal/mag? It is only needed in slightly higher quantities during flowering. Any decent "grow" nutrient will have more than enough cal/mag in it to be adequate for all stages of vegetative growth. Your leaves are showing signs of being burnt by too much fertilizer, also maybe burning caused by getting the leaves wet while the light was still on. These plants are still very young and the nutrient requirements, plus what is in the "soil" already, means very little fertilizer is needed at the moment. I would only be giving them, at this size, perhaps one dose of quarter strength fertilizer once a week. Once they have become truly established with branches and a height of 14-18 inches, only then would I consider feeding more often. I have found it is better to give weaker feedings of nutrients more often, rather than strong doses all at once. By this I mean, rather than give a weeks worth of feeding in one go, give your plants four feedings of quarter strength, over 10-14 days, depending on size and soil conditions/health. This way there is much less chance of overfeeding and burning the leaves or making the soil toxic. You wouldn't give a toddler a T-Bone steak and it is much the same with young plants, gentle feeding often and not feasts all at once. Hope this helps.... Organoman.

Leave it as long as the branches are fine.. let soil dry out bit more between watering.

There are generally three reasons for the dying off of your plants’ leaves: a pH imbalance, too much or too little water for your plants, or nutrient deficiencies and toxicities. Start with checking the pH of your runoff. Always best to start there then diagnose further. 🤘😤