Cardamine hirsuta
Tue, 02 Apr 2013 21:51:15 PDT
Yes, sterilising soil with steam is an excellent idea. Just heat the  soil 
deep enough, some seeds may be pretty far down. Russ H.
In a message dated 4/2/2013 6:20:08 P.M. Pacific Daylight Time, writes:

This  little pest is also in my garden, and I have shifted to the use of 
boiling  water or steam (as with a steam-producing floor mop) to control 
cardamine  seedlings. This is especially effective on my gravel paths. Vinegar 
sprays  also work, but in my damp climate, steam seems the best as I don't 
have to  wait for a dry day.  

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