Help, I brought back 15 young potted fushias from Oregon. They are about 6 inches high. The have developed a Black on the tips of the leaves and two of the plants have die all ready. I am removing the infected leaves that are curled and black tipped , been careful to remove the leaves. I am watering them only once every three days, I have inserted Miracle grow food sticks for food. The pots have holes in the bottom so there is good drainage. The potting soil is moist , not soaked. I potted them in potting soil from China which looks like a wood by product. Can anyone gie me a suggestion? At this rate they will all be dead in a week.