Outdoor plants

I've never tried to grow dope plants before so I'm not sure what is happening I'm helping a friend out. They are left outside all the Time they get sun and I water them a lot but they are going yellow at the ends some brown somebody please help! I only use water nothing else. They are only small is there any way of getting them back to all green?

i think u need to feed them something bc if u only useing water they are not getting enuff NPK

more detail will help, need pics, ph of soil, whats in soil, frequency of watering etc.. the more detail and pics the better

from the brief amount of information could be nitrogen deficiency or over watering or both.

quit watering them so much.

As tws from the way you've described it sounds like you giving em far too much water. I had one plant in a small pot and it was yellowing ,not because it was in a small pot but because I had to give it more water than the bigger ones because the heat is intense here . all the crap in the water nowadays and flushing the nutrients outta the soil with so much watering made my plant yellow in my opinion , I put it in the ground now and its fine.