This plant latin name is Tagetes minuta L, It is called black peruvian mint; black peruvian marigold and huacatay. It grows 6-10' here. Grows up to 10' in the mountains of Peru.
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Your cost for a packet of seeds. The oil from this plant is used for fungal infections and as an insect repellent. Policemen have given it a second glance. But once it is smelled they went away laughing. I was told it loks very close to marijuana.