One of the delights of buying an older house is discovering the surprises planted by previous owners. Like the daffodils, grape hyacinth (the purple flower clusters) and columbine leaves in the photo above, in a flower border now overtaken by lawn.
I'd guess from the yard's unkempt and overgrown character that no one has done any actual gardening, or pruning, or tending anything except the lawn in this yard for a very long time. Perhaps many decades. And even the lawn isn't in great shape.