Pollen specialist bees are less common. Colletes, Andrena, and Osmia fly in early spring. Andrena have among the most species and specialists of Asteraceae (aster or daisy family). Eumellisodes are associated with Cirsium (thistle). Specialists also visit common flowers at times, e.g. Solidago. Some species also have habitat specialization (e.g. Melittidae and bogs; Lasioglossum vierecki or Crabronid wasps and sand).
Brood parasites are uncommon on flowers, but may be lower to ground by nests of host bees or wasps (e.g. Sphecodes, Nomada, Coelioxys, Psithyrus, Chrysididae). If collecting insects, using bowl traps or sweeping through plants at ground level with sturdier nets are ways to find them. Traps are also useful for small species in general.
Highly diverse groups include some uncommon species (e.g. Braconidae, Diapriidae, Ichneumonidae, Pompilidae, Dialictus).
Advice: Start in early spring. Visit many flowers or habitats, like urban gardens and parks, and more natural meadows, forest edges, and wetlands, and specific habitats/plants with specialist associations. Garden with native or specialist plants. Or add nest material, like sand, soil, twigs, plant stems, water, or artificial bee or wasp nests (bee hotels/homes).
Does anyone have advice or experience? Or experience planting specialist flowers or using artificial nests?
Notification list for new bee or wasp posts. Ask to join if wanted. Include in new posts: @liquidanbar @neylon @trevorsless @tockgoestick @beeboy @lydiahagarwong @rustybee @ny_wetlander @eebee @nsharp (continued below)