Blossoming Questions

MINE (HYDRANGEA) HASN’T BLOOMED IN SEVERAL YEARS. THE PLANT LOOKS FANTASTIC, JUST DOES NOT BLOOM. IT’S 9 YEARS OLD.
HOW DO YOU CHANGE COLOR ON HYDRANGEAS?
I JUST BOUGHT A SUMMER CRUSH HYDRANGEA AND IT IS BLOOMING PINK. HOW DO I GET THE RASPBERRY COLOR AS SHOWN ON THE CARD WITH IT?
MY GARDENIA LEAVES TURN YELLOW AND THE BUDS TURN BROWN BEFORE FALLING OFF. WHAT AM I DOING WRONG?
WHAT FLOWERING PLANTS CAN I PLANT IN FULL SHADE?
Q
HOW DO I KNOW IF MY PLANT NEEDS FERTILIZING?
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