Hi, this 6-7 foot tall purple stemmed plant appeared in my front yard recently (and grew very quickly)... and I have no clue what it is! Help! Thanks!
Definitely an amaranth, looks like the ones that grow down here. If you like it, let it bloom (the flowers are quite attactive.) If you don't like it, pull it out before it can set seed (the plant can quickly become invasive.) If you let it seed, you'll never see the end of it.