How do you kill invasive Oxalis?
Nan Sterman via pbs (Sun, 11 Oct 2020 21:21:04 PDT)
That would be solarizing and it is done with CLEAR plastic rather than black (black shades, clear heats) and it is done when the sun is highest in the sky as basically, you are using the greenhouse effect to superheat the soil. In Arizona, Pamela, it might still work even though we are past the longest days of the year. It can’t hurt. To enhance the effect, add a second layer of clear plastic with a two inch air gap in between. Cut the foliage back to the surface first and saturate the soil so it holds the heat for as long as possible. Turn the irrigation off to the bed.
It usually takes six to eight weeks and you may have to repeat it after the initial treatment.
Here’s a link to more details on how to do it <https://waterwisegardener.com/2011/08/…>.
Nan
On Oct 11, 2020, at 5:55 PM, Pamela Slate via pbs <pbs@lists.pacificbulbsociety.net> wrote:
Hi Friends,
I have a 12' X 4' raised bed where I've grown a number of bulbs.
Unfortunately, two spp. of Oxalis has misbehaved to the point that I've had
to remove all plants I wish to keep, wash all roots to rid them of invaders
and relocate them. Once the bed is empty except for the lusty Oxalis, how
do I kill those remaining bulbs, some of which are two plus cms in diameter?
Sometime this year, I recall a post that said if you cover the entire area
with dark plastic and of course, suspend watering, new bulbs will be unable
to form. But what about the old, mature bulbs? It seems they will continue
to be viable for a long, long time.
SOS, please help and thanks very much,
Pamela Slate
AZ USA Zone 9-ish after the most brutal summer ever
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