Hibiscus: Cutting back Hibiscus Tropicals for the winter., 1 by carlo05

carlo05 wrote:
All growers, collectors and commercials I know recommend a fertilizer vey low in phosphorus (I use a 14-5-29) during the growing season and an standard 20-20-20 during the Winter.
The AHS Hibiscus Handbook says literally:
"Phosphorus applied to the soil will not leach out and remains available for a long period. Too much phosphorus, especially on alkaline soils, will tie up or render unavailable most minor elements, especially iron. Once this situation ocurrs it can take as long as 12 months to correct or lower the phosphorus level in the soil. For this reason, a fertilizer formula relatively low in phosphorus is desirable".

Here you can read more
http://www.hiddenvalleyhibiscus.com/care/feeding.htm
http://loyno.edu/~gerlich/NOHS/care.html
http://www.atouchofthetropics.net/care.shtml#sp2
http://www.exotic-hibiscus.com/care/winter.htm

Regards

Carlos