leafs went thin

Hi everyone. So I've had these orange dream outside for about two months and have noticed the leafs have started to thin out and the plant itself has stopped growing. What am i doing wrong....Its been in the high 90s sometimes over 100°. They are in nursery soil and get fed Humboldt organic nutes every other watering. Help me please I dont know what's going on.

Probably a sativa dom strain just showing its true colors? Is there no growth at all, or just no vertical growth? Bushing out is what most people consider a good thing

No growth both ways. They got bushy and tall pretty quick then just stopped when the weather got really hot.

root bound? How big is your pot?

There in ten gallon pots. But not completely filled to the top so I'd say about 8 gallons