inexpensive sources of high nitrogen

A plant that gets along fine in one environment may be very invasive in another. That is especially true if you are talking about two different continents.
Examples abound. Kudzu and Water Hyassins are a big problem in Southern USA, but not a big deal where they came from. There are many plants that are local to me (central Michigan, USA) that are no big deal here, but are causing big problems elsewhere.
Ray Drouillard
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