We have a beautiful Hibiscus Sinensis that we planted last year and it began flowering immediately. It's now more than a metre high, very healthy, lush foliage, covered in buds - but none of them are opening. Even the ones that start to show some colour suddenly drop. We've checked inside the buds and all over the plant - no bugs. The hibiscus is in full sun. We've sprayed it with some Seasol and it's regularly watered by a micro-irrigation system. Would welcome any advice.
Hi Mel
I think that your Hibiscus needs to be fertilised, there are fertilisers especially for Hibiscus but any fertiliser for flowering plants and shrubs will be affective. Seasol is not a fertiliser it is a tonic. Tonics do make the soil better for the plants but they do not contain the balanced ratio of Nitrogen, Potassium and Potassium that are found in fertilisers and needed by the plants for healthy growth.