Cardamine hirsuta

Kathleen Sayce
Thu, 04 Apr 2013 11:51:25 PDT
I have asked a researcher in England if I can get permission to repost a paper on annual Cardamine species in horticulture. 

There is another explanation for suddenly seeing a new crop of seedlings, which is that there may be more than one weedy annual Cardamine species in your garden. Each species germinates at different times, so you may extirpate one species, only to see another species appear. 

When I hear about whether I can post this paper, I will let the group know. 

And mea culpa, I replied to Alberto privately about vinegar when I should have replied to the group:  Vinegar works, full strength, with a surfactant, on seedlings. Don't expect it to work at all on established plants. It might burn down the tops, but can't hurt the roots, so any reasonably healthy older plant will bounce right back. For seedlings, however, it can be a very effective method of control. 

However, as you need dry weather to apply it, which I rarely have, I have moved to using boiling water, and then to using a steam mop (yes, a household steam mop) to control seedlings in extensive areas, and especially in gravel. This does not penetrate very deeply, so I do not expect dormant seeds (or bulbs) to be killed. But it definitely takes down the seedlings in a hurry. I hope someone designs a portable battery powered version soon for yards, as my biggest problem now is running to the end of the extension cord.  : -)


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