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The result is a combination of plants that provide structure and texture, and flowers such as euphorbia, echium, helichrysum and agapanthus.

In addition to fulfilling custom orders, they offer a single fresh arrangement each week, available in three sizes, consisting of a lively mix of blooms such as sunflowers, delphiniums, dahlias, agapanthus and scabious.

The Arabian jasmine recalls the garden plants of Obama’s native Hawaii; the chrysanthemum is the official flower of Chicago; and the African lily, or agapanthus, an allusion to his Kenyan forebears.

Kirchmann kept the agapanthus, trumpet vine and roses because they were well established and planted drought-tolerant shrubs, perennials and succulents — lavender, rock roses, lantana and iris among them.

In Georgetown, the agapanthus, from Africa, is emerging from the ground.