Q.Why Is My Leaf This Color?
My bell pepper leaves have a weird, splotchy discoloration. I’m using a double cup method so the roots are able to get water from the bottom of the cup when needed. They are currently growing inside.
Certified GKH Gardening Expert
Using this method without aeration will cause root suffocation. This will also promote anaerobic bacteria to form, which will throw the pH off. This causes twisting and discoloration.
If you are using this method, make sure to change the water daily.
If you were to, instead, water from the top and let the excess go into the second cup, then throw out the extra that pools up (Kind of like using the second cup as a saucer instead of a watering source) I think will you have much greater success with much less effort.
Good, old-fashioned watering is best if you can't get oxygen into the water.
This article will help you to care for Bell Peppers: