I clone has a much smaller and weaker root system than a plant from seed. A plant from seed has a long tap root that keeps looking for water. The root span of a clone is much smaller.

Before heat wave clone roots support top growth. Now the roots can not get enough moisture to keep top alive.

Here's what I would do. Stop the ferts. Now. Wait til it gets cooler. Flush your area. This evening.

Get a large plastic jug. fill it with water. poke a small, SMALL!!! hole in the bottom. Put it at the base of your clone. Let it feed a constant flow of water to your roots (a drop a second is ok). Keep doing that until it gets cooler.

Good Luck
oldhaole Reviewed by oldhaole on . HELP! first time grower I have 8 outdoor clones that i got back in the middle of juin and they were goin great until today. there has been a heatwave since yesterday and the leaves are curling upwards and turning yellow brown. i have increased the watering because of the intense heat its been 35C+ degrees for a few days. I ive them nutes every 3 weeks but im not sure if this is rite and the mix i got is a 20-20-20 wich i had looked up but im still not sure Any help will be amazing ill post pics rly soon. What Rating: 5