Look for bumblebees and leacutter bees in perennial sweet peas. The blossoms are a great source of nectar and pollen. However, the bumblebee seems better equipped to trigger the keel of the blossom to release the pollen and get right into the nectar tube. I noticed that this leafcutter bee was not triggering the blossom, but still sipping nectar. You can see the damage her feet are making to the flower as she struggles to find purchase.
You can see the nectar guides and the damage clearly in this photo. When a bumblebee depresses the keel a stamen wraps around her back and dusts it with pollen. I have seen leafcutters with pollen I thought was from perennial sweet peas, but now I'm not sure how they would harvest it. Keep a look out for clues! These sweet peas are unscented, but the annual varieties are not as attractive to bees.
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