leaves curling

Hi All, I live in Phoenix AZ, and recently received a Satsuki Azalea. The leaves are turning black/brittle at the ends and I was wondering if any of you had any recommendations. For the past three months, I would keep outside on my patio during the AM and into the late afternoon, I only have a...

I have a green leaf Japanese maple (my first bonsai) whose leaves have been curling. I originally thought it was underwatering, but I'm now afraid it might be an infection. Could it be an infection? :( Timeline: - Mid-December - Bought plant. Watering schedule is once a week, in partial sun. -...