There are hundreds of bee-plants, flowering plants which attract bees. Here is just a small selection:
Herbs, including mint, thyme, sage, rosemary, lemon balm, fennel, dill, coriander, lavender, oregano
Borage family members including borage, echium, forget-me-not, lungwort, comfrey
Daisy family members including dandelion, simple daisies, sunflower, thistle, aster
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Pea family members including clover, vetch
Fruit shrubs and trees
Foxgloves, mullein, snapdragons
Crocuses, bluebells, alliums (including onions and leeks that have bolted)