Over what domains does Persephone preside? Do landscape architects work with any of #1?
Landscape architect
person involved in the planning, design and sometimes direction of a landscape, garden, or distinct space
Would Persephone be a good consultant to a landscape architect?
Persephone is a vegetation goddess.  A vegetation deity is a nature deity whose disappearance and reappearance, or life, death and rebirth, embodies the growth cycle of plants. Landscape architects deal with planning and laying out gardens and other plant life.