First Time grow, first little problem.

Hey everyone, I have been utilizing this thread often lately and am getting a ton of great feedback and help. I have two plants growing (my first grow) and up to now everything has been pretty smooth. I noticed maybe a wk back that the bottom two leaves on both my plants were starting to yellow a little. It's been getting a little worse over the wk and now on one plant they're pretty much just yellow. The rest of the plants are fine, all the other leaves and stems. It's just the bottom two leaves on both plants. I'm feeding them 1/4 strength Pure Blend Pro Grow. They have received fertilized feedings the last two waterings. Any thoughts???

Maybe they are getting too cold at the bottom. Try to keep the temperature above 65 degrees F at the absolute lowest. Try to maintain 72 F constantly if you can.

Those leaves in particular look to be the first single set of serrated leaves that plant grew. Totally normal for them to die off at this point. Being on the bottom and receiving little light, they will lose those and even a few others too at certain stages.

Thanks. Yea those were the first two serrated leaves that the plant produced. I keep the temp at a "day" temp of 78 degrees and a "night" temp of about 72.