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A great combination is Verbena bonariensis, cosmos and cleomes. To cover bare soil, use ground-huggers such as alchemilla, hardy geraniums, bugle, heuchera and epimedium to create a woven tapestry of flowers and foliage.
Having said that, the list of flowers that support hummers include salvias, petunias, nasturtiums, flowering tobacco (Nicotiana), cleomes, impatiens, bee balms, foxgloves, columbines, lupines, honeysuckle shrubs and vines, plus dozens of other perennials and annuals.
"Cleomes (Cleome hasslerana) are easy-growing, carefree flowers that can hold up to late summer heat spells and droughts," she says.