Low maintenance flower bed- Have any suggestions?

We have a flower bed that is overgrown with weeds. There are perennials (irises and lilies) that we would like to incorporate into the new design. The area is raised quite a bit from the regular lawn with a 25-30 ft pine tree in the middle. We are not sure what the best/inexpensive way to make it cohesive so it can have grass and plants (low maintenance). Adjacent to it is our garage where we would like to incorporate a flowers/bushes. Have any suggestions?

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