This plant grows on my balcony in Vienna, Austria. It gained most of it’s current height (30-35cm) during the last 2 weeks. Before I didn’t notice it. enter image description here It is covered with tiny white hairs. I conducted a couple of tests. They never stung. The leaves are toothed (I believe “serrate” is the official terminus for this type of edge).

From a central leaf vein, more veins spread out in a manner that seems somewhat irregular to my untrained eye: enter image description here

Edit: Now, in July, that is about 2 months later, it bears flowers. Furthermore it is about 3 times taller. I believe there were seed heads, which have been blown and washed away. All of this would fit Conyza mentioned in the comments, but the shape and density leaves appear to differ from C. boranensis or C. canadensis. enter image description here

Edit: now, still July some seed heads have reappeared enter image description here

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    $\begingroup$ It is similar to Conyza canadensis, but the shape of the leaves makes me uncertain $\endgroup$ – Saul Pierotti May 10 '18 at 21:09
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    $\begingroup$ Conyza canadensis can have these serrated leaves, although usually not this strong. The amount of flowers is also a bit much. Hmm, dunno... $\endgroup$ – RHA Jul 16 '18 at 18:40

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