Oxalis is a nasty weed and hard to get rid of. There is no quick fix, you will need to continuously keep on top of it to get a really good result. There are a few methods to consider. If you are an organic gardener you could try pouring boiling water over the leaves. Do this every time new shoots appear. Also try mixing 2T of baking soda with a dash of dishwashing liquid and 500ml of water and squirt on the area the oxalis is. Apply during the heat of the day and repeat. They all work on the principle that the leaves take energy from the sun so if you keep killing the foliage the bulb will eventually weaken and die. You would need to persevere for a year or two before finally getting rid of it. The other option is to try Death to Oxalis, this is NOT an organic product so I would be hesitant to use around food crops but good for Oxalis which is growing amongst annuals, ornamentals etc. It is a powder which is mixed into a solution and applied as a spray to oxalis leaves and flowers. DTO works best when sprayed in the heat of the day and in full sun the hotter the temperature the better. DTO will not kill other plants when applied at the recommended strength. There may be some slight burning of delicate plants. DTO works by burning the leaves and flowers, which then die off. This weakens the bulbs by starving them. If new leaves appear another spray will be required to kill them. In this way the oxalis disappears from sight, and you do not need to dig up other plants to remove the bulbs.The following season the young bulbs which may have fallen off the dying parent bulb may throw up new leaves. These will now need to be sprayed. DTO is not systemic and can be bought from Palmers. Therefore you need to weigh this all up, digging out and completely removing the soil to a really good depth and starting from scratch may be more successful in this particular situation.
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