Alliaria officinalis (Cruciferae) -- This member of the mustard family is an all too successful import. I saw a special on Wisconsin Public Television in '97 that told how it is taking over the habitats of native species. It is an early, hardy plant of medium height, which grows rapidly, speads readily, and remains until the end of summer. Thus it blocks the sunlight from shorter or later blooming native species, preventing their growth. In order to prevent spreading, it must be eradicated early (eg.before it seeds the first time in the year). The good news is that it's edible. The young leaves (which smell like garlic when crushed - a plant defense against insects) can be eaten raw or cooked, and larger plants may have a taproot which can be used like horseradish. It blooms first in spring, and can have a second blooming later. (Photographed in WI)