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Perennials. Early research on flowers for beneficials has focused primarily on weeds and wildflowers growing around farms, to discover which of these plants farmers might encourage to help with pest control. Gradually, more ornamental plants are being identified, and we now have a very nice list you can choose from:
Trees and shrubs. Top choices include willows (for their early spring pollen to provide a food source and get overwintered beneficials off to a strong start), forsythia, firethorn, potentilla, ceanothus, four-winged saltbush (Atriplex canescens), euonymous, and Texas sage (Leucophyllum frutescens).
Cover crops. Clovers and other soil-building cover crops provide pollen and nectar, alternate insect prey, and shelter. Crimson clover is as beautiful as any "regular" flower, and buckwheat is a standout because it grows very, very fast and has extrafloral nectaries that attract a wide variety of beneficials even before it begins blooming.