If they are planted close together one tunnel will lead to nirvana. Moonbeam coreopsis, like all coreopsis, is low on the list for deer. They may take a taste, but generally leave it alone. Coreopsis is hardy to Zone 4. It has a very dainty appearance.
Coreopsis needs full sun.
Malva, I m not familiar with and haven t been able to find in the books. However, Salvia, is a great deer resistant plant that gets pink, white or purple flowers in the summer. It is also called sage. This plant comes back every year. Salvia needs full sun.