Purple loosestrife (Lythrum salicaria) is native to Finland, considered harmless and ornamental. Oddly enough, it is labeled an invasive species in the States, much in the same way that lupines are here. Regardless of weed status, we have these in our perennial border and I think the purple spikes are pretty! The flowers have a long history of medicinal usage, especially for digestive tract complaints. They can also be used for various external healing purposes — skin, eyes, and nosebleeds. Sounds like a floral version of aloe vera gel, come to think of it. That puts this plant firmly on my list of herbs to gather once I get a dehydrator and some spare time in the future.