I am assuming these are perennial lupines? They need their foliage to photosynthesize all summer into fall, and stay healthy, so I’d clean them up (deadhead I suppose) and otherwise keep them growing. Don’t smother them with annuals, but if there is room between them or in front/back, fine to choose anything you like that is tolerant of poor soil, which might include California poppy or portulaca (can be weedy) or some of the ice plants I am seeing sold for annual color now. A lot of the decision will be around availability at this late-June timeframe.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.