If you find a grounded, tired, or cold bumblebee, gently move it onto a nectar-rich flower in a sunny, sheltered spot. If it does not recover within 30-60 minutes, offer a one-time boost of white sugar mixed with water (50/50 mix) on a spoon or cap, never honey.
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If a honey bee hive might be at risk of collapsing you might give them honey, but we always fed the hive with sugar and water mixed.