Niger seed plant - This is the stuff black "thistle seed" comes from. Finches love it and it is included in most bird seed mixes. Obviously it is not a thistle, but rather is more closely related to sunflowers. The plant is from Africa as its name suggests. It is now politically correct to sell this as "Nyjer" seed, which emphasizes a phonetic pronunciation. Almost all used in USA is imported. American Niger Seed Company sells clean seed you can easily grow yourself in USA and Canada.