Hi

If you cannot mow it often - its a good idea to plant a clover/seed that re-seeds itself. Birdsfoot trefoil is often mentioned as a good choice - but its expensive. Some white clovers like Dutch also reseed well - as does Red Clover like Dan mentioned.

If you can mow 2-3 times a year - most any clover will be attractive - especially on strips in a goldenrod field. Dont forget the inoculant.