Most definitely! You said "barn." I've often seen many introduced herbs such as motherwort, nettle, burdock, and more on old farmsteads - my own place included. While some find motherwort weedy, it does have appeal like being a medicinal herb and its lavender flowers are a great bumblebee magnet. FataMorgana

man this one is very stubborn. The root is like dandelion's but not that deep, If I hand pull them the root won't come up. I have the dandelion digger but there's lots and lots of these in my lawn. I notice that me and my other two neighbors also have this kind of weed, but not everyone in the neighborhood. This weed is not very common in my area... so any idea why that is? I hand pull them 2 weeks ago and now look at how fast they've grown back!!

I am on CA, it looks like: crabgrass, dallisgrass, foxtail. dig one up and take it to your local nursery for identification and control recommendation and purchase or control.

Black Medic, a member of the clover (legume) family that grows best in compacted soils with low levels of organic matter. Short term controls are spraying with plant poisons while long term control is achieved by correcting the soil conditions that it likes to grow in. Start with a soil test for soil pH and major nutrient levels and then dig in with these simple soil tests to see what else needs be done. 1) Soil test for organic material. From that soil sample put enough of the rest to make a 4 inch level in a clear 1 quart jar, with a tight fitting lid. Fill that jar with water and replace the lid, tightly. Shake the jar vigorously and then let it stand for 24 hours. Your soil will settle out according to soil particle size and weight. For example, a good loam will have about 1-3/4 inch (about 45%) of sand on the bottom. about 1 inch (about 25%) of silt next, about 1 inch (25%) of clay above that, and about 1/4 inch (about 5%) of organic matter on the top. 2) Drainage. Dig a hole 1 foot square and 1 foot deep and fill that with water. After that water drains away refill the hole with more water and time how long it takes that to drain away. Anything less than 2 hours and your soil drains’ too quickly and needs more organic matter to slow that drainage down. Anything over 6 hours and the soil drains too slowly and needs lots of organic matter to speed it up. 3) Tilth. Take a handful of your slightly damp soil and squeeze it tightly. When the pressure is released the soil should hold together in that clump, but when poked with a finger that clump should fall apart. 4) Smell. What does your soil smell like? A pleasant, rich earthy odor? Putrid, offensive, repugnant odor? The more organic matter in your soil the more active the soil bacteria will be and the nicer your soil will smell, to a point. Too much organic matter can be bad as well. 5) Life. How many earthworms per shovel full were there? 5 or more indicates a pretty healthy soil. Fewer than 5, according to the Natural Resources Conservation Service, indicates a soil that is not healthy.