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Among the plants that attract hummingbirds are bleeding hearts, cardinal flower, impatiens and petunias.

The entrance to the house is defined by an arched tunnel supporting kiwi vines, cardinal flowers and a hardy passionflower.

The clearing has allowed native species such as cardinal flower and Canada anemone to grow back.

Weaner lives on a one-third-acre plot in suburban Philadelphia and has nurtured desired seedlings as they have emerged, from drifts of cardinal flowers and golden ragwort.

On a sultry afternoon recently, Regina Myer, president of the Brooklyn Bridge Park Corporation, walked past profusions of swamp milkweed, rose mallows and cardinal flowers.