one of my rhododedrum's leaves seem to be wilting about 3 days ago. I planted 2 plants in april this yr. I put compost and peat in the holes and they seem to be doing good till 3 days ago. I did put rhododedrum fertilize around them last week. I always watered them when the soil was getting dry. The other plant seems fine. The leaves on the plant in question are very green with no yellowing or brown leaves. it is making buds for next yrs flowers. The 1st 2 pictures are of the plant in question, the 3rd pic is of the plant that seems normal. any ideas or suggestions please?