What are the pros? NOTHING
What are the cons? This is a terrible weed!!!!!!!
This weed was introduced by the rail road 40 years ago being picked up from people who planted it in town. Nothing eats it and we haven't been able to kill it with chemicals either. We pull as much of it as we can each year and try to keep it in check, but it's a constant battle. If you don't have it, take my advice and pull it if you ever see it as the seeds can last in the soil for 100 or more years
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