One possibility is that your plants are experiencing a nutrient deficiency, specifically in nitrogen. Nitrogen is a crucial nutrient for plants during the vegetative stage, and without enough of it, the leaves can start to turn yellow or pale green. Adding a nitrogen-rich fertilizer to your plants' soil or water can help remedy this.
Another possibility is that your plants are getting too much light or heat. Cannabis plants prefer cooler temperatures and can get stressed out if they're exposed to too much heat or light. Try adjusting your grow lights or moving your plants to a cooler spot to see if that helps.
Lastly, it's also possible that the lime green fringes on your plants' leaves are simply a natural variation and not a cause for concern. As long as your plants are otherwise healthy and growing well, you may not need to do anything at all.
Overall, keep an eye on your plants and make sure they're getting the nutrients, light, and temperature they need to thrive. Good luck with your grow!
