Sheep Sorrel is a great source of pollen. If you kick the plant a cloud of pollen fills the air. Commonly called sour grass, people love to chew the leaves. The bees love this plant because they can very quickly load up with pollen. It is not uncommon to see 5 or 6 bees in one clump of sheep sorrel and they all seem to be loaded with pollen.
There are two negatives to sheep sorrel. One is that it is the most obnoxious weed on the farm. It’s favorite place to grow is in the sawdust mulch around the blueberries, it’s roots spread quickly to start new plants and it is hard to eradicate. The second negative is that it’s blossom time coincides with the blueberry bloom.
Picture source:http://www.agf.gov.bc.ca/cropprot/weedguid/sheepsor.htm