outdoor leaf tips pointing up.

hi everybody, I have few jack the rippers outside, and they where doing fine. They are about 5 to 6 ft tall. Anyway i just realized that some or the leaf tips are pointing up, and turning yellow. does anybody know what this is? the temps have climbed in the last two weeks reaching 103 Degrees. don't know if this is the problem.

Just the heat doing that to the leaves, little bit of stress. Make sure to water in the morning or evening and not during the heat of the day.

boiiiiinnnnggggg