I have a problem with an endless summer hydrangea - started out well in a pot on my north patio under the cover with a little morning sun, then the ends of the leaves looked fried so I moved it to all shade. Now it's wilting and it seems that the more I water it the worse it looks! I planted it in acidic soil and am watering with acid plant food almost every time I water it, which is every other day. I water thru the whole pot until it drains out the bottom. The pot is not too small, it's bigger than the plant and deep. Is it just too hot in Texas for this plant? It's been 100 and humid. What am I doing wrong?