Some cats do eat marigolds although most marigolds are harmless and non toxic to cats.
However French Marigolds are slightly and mildly toxic to cats if they ingest them in large enough quantities.
Although some cats are actually repelled by marigolds but it depends on the cat.
Some plants that can repel both cats and mosquitoes include lavender, citronella, lemon balm, rosemary, and marigolds.
These plants contain scents that are unpleasant to most cats and mosquitoes and can be used to create a natural barrier in your garden.
Spider plants, ferns and colorful bromeliads and marigolds are all harmless to dogs and cats.
Beautiful moon orchids are safe too.
The plants that are toxic to cats include.
Lily
Amaryllis
Oleander
Autumn crocus
Daffodil
Sago palm
Tulips
Rhododendron
Chrysanthemum
Cyclamen
Dieffenbachia
Hyacinth
Aloe
Azaleas
English ivy
Widow's-thrill
Lily of the valley
Yew
Mistletoe
Castor bean
Hydrangea
Poinsettia
Spring bulbs
Marijuana