It looks like you have a lot of salt build up. And possibly over-watered, And there's definitely some nutrient issues. You can go to walmart and but a cheap pH tester kit in the Fish section.

If you are using nutes you should discontinue them until the plant is a little healthier.

You should only water every 3 to 5 days or when the planter feels light depending on the size of your planter. If you have a scale. Probably a bathroom scale, just depends on size of planter. Let her dry out for a few days, to where you can stick your finger into the soil up to the 2nd knuckle and your finger come out dry. Once she is dried out put her on a scale and weigh her, take note of it. Now water til you get 1/4 runoff and re-weigh, take note and use these as references for watering.

Hope this helps!!

And that's another thing. You should have started them in 16oz Solo cups and done a graduated transplant. This could also be a factor in its slow progression. As the plant starts in a smaller pot it has time for the roots to become healthy and become root bound, After it becomes root bound you transplant to a 1 gal, then a 3 gal and so on. You may have caused stunted growth by starting her in such a larger container.
ThePinkJina Reviewed by ThePinkJina on . Slow growth problem.. do I change photoperiod? Hello I'm a little new to this and this is my first grow. I've been having problems with the PH of the sustrate and my plants have been growing very slowly, so slow they're in their 25th day of veg grow and they tallest one is only 12 cm tall. Theyre meant to grow for a week more, but I dont think they will be taller than 15 cm. I'm not sure if I should let them stay in veg for a few more weeks, with the problem that I dont have a lot of time and the bill will also raise. Please I need Rating: 5