A garden in a dream typically reflects the parts of yourself you're deliberately tending -- habits, relationships, or projects you've invested care into and are watching take shape. An overgrown or neglected garden can point to areas of your life that need more attention, while one in full bloom often names growth you can already feel paying off.
The Superior Planets are most efficacious; the inferiour are weak, and easily do suffer by the Superiours, and receive good or ill from them. - William Lilly (1602.-1681.)