hibiscus bud drop
We have a tropical hibiscus, Brown Derby, which has bud drop. The plant is approximately 18 inches tall and looks healthy, but as the buds develop they get to be a good size and drop. It is so disappointing!! It is planted in a plastic pot with good drain holes, it is in Miracle Grow potting mix, and we keep it outside so it gets good sun. Because of the heat we water it every day using a drip irrigation system. We have examined the plant closely and see no bugs. We have even opened and examined the dropped buds and still see nothing. Still we sprayed lightly with Bayer insect, disease and mite with no resolution of the problem. Does anyone have any ideas as to what the problem could be and what to do about it?