Some native plants are dangerous to honey bees

No good deed goes unpunished: Planting a California buckeye (Aesculus californica; Wikipedia image at right) in your yard will benefit the native bees, insects, and birds that co-evolved with the tree, but could be trouble for more recent arrivals, like the European honey bee (Apis mellifera). The pollen can cause worker death and sometimes lead to failure of a hive. If there are other nectar and pollen sources nearby, the honey bees will ignore the buckeye — another reason to plant a variety of flowering plants in the garden.  Fundamentals of California beekeeping lists death camas, corn lily, and locoweed as other dangerous plants, and local beekeeping organizations may know of others.  (San Francisco Chronicle)

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