Luke wrote:

This is probably the third time someone has posted about this problem but
with my Gardenias the leaves are still yellow after a couple of months using
Magnesium to overcome it. Could there be anything else causing this, the
plants get morning sun only and haven't been over watered. The buds also end
up drying out and dropping off, they do not open up. Does anyone have any
clues.

Thanks
Luke


Check the soil pH. Have they been fed lately? Gardenias are heavy
feeders during spring. They need plenty of water too. It could be an
iron deficiency rather than Magnesium. Use chelated iron for that.


HTH
Jane