Gardenia's are acid loving plants. Put a handful of Holly Tone fertilizer
and a handful of Blood Meal (Nitrogen) around the bush above the root ball.
You should see some improvement in a couple of weeks. Yellowing could be
from two things. Not enough nutrients, mainly nitrogen or too much water
standing at the roots. I used to see yellowing on my gardenia every spring.
I added the amendments listed above and they always responded wonderfully.

Penny
Zone 7b - North Carolina
wrote in message
...
Is there any special treatment that I should be giving my gardenia.
The leaves are turning yellow. The flower buds were on the plant when
I bought it a month ago and they are still tightly closed and the
small "petals" around the bud are turning yellow.

Lori