Paperchase said:

These are auto flower grown I HAPPY Frog soil only been given sst and was just recently top dress with BuildAFlower top dressing this started happening a few days

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Ninjadogma said:

If you're talking about the yellow in your tops, it just looks like a chlorosis attributed to rapid growth. The plant is growing so fast it doesn't have time to fill in the chlorophyll right away but you can see that it does fill it in. You could check pH to see if a high value is interfering with iron uptake, but I doubt it. Don't assume the worst but check it just in case.

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Galgrows said:

You can also move them under shade if it's too hot in that spot for too long. Try moving them into the shade keep giving them NPK ferts.

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