Oxalis obtusa

Jane McGary janemcgary@earthlink.net
Sun, 26 Jan 2020 13:08:34 PST
Does anyone know how to eliminate Oxalis obtusa? I brought it into my 
present bulb house by accident, presumably as dormant bulbs (or whatever 
their tiny storage organs are properly called) that had got into the 
tunics of bulbs I brought deliberately, or that were clinging to some 
pots. All subsequent attempts to control it have failed, even replacing 
quite a bit of the plunge material where it's growing. I was just 
weeding out the crowns and wondered if there's a point in its growth 
cycle when the dormant bulbs have produced growth, but when new bulbs 
are not present. There are white stolons dropping from the crowns, and 
perhaps these will produce next season's storage structures. Can anyone 
advise on this?

Although attractive in flower, it's a real pest. Fortunately it's not 
winter-hardy outdoors here. Don't ever let it loose in a warmer garden!

Jane McGary, Portland, Oregon, USA


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