How to Kill Oxalis in Flower Beds
Oxalis is a persistent perennial weed that is tough to kill. Selecting the right herbicide is crucial, because many herbicides are not safe for use on flower beds. Choose a broad spectrum weed killer in granule form, as granular herbicides are generally safer for flowers than sprays. Check the label to ensure your herbicide won't harm the varieties in your flower bed. Does this Spark an idea?
Instructions
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Check the label of your herbicide to be certain it is safe for the flowers in your garden. If your plants aren't listed on the label, it is probably safe to use in your flower bed.
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Dig the oxalis tubers up with the garden spade. Remove as many as possible, but be aware that you may not be able to eradicate all of them. Destroy these tubers in your compost pile by burning them or dispose of them in the garbage.
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Spread the herbicide granules over a small area of your flower bed. Allow two or three days to ensure the granules don't harm your plants. If you find damage to any of your flowers, water your plants thoroughly to wash away as much of the herbicide as possible and look for another brand.
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After the test period has lapsed, spread the granules over the rest of your flower bed according to the package directions. Keep granules at least 6 inches away from your flowers to avoid possible direct damage.
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Use mulch over the soil to prevent new weeds from emerging. Pine needles or decaying leaves work well and have the added benefit of fertilizing the soil as they break down.
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Tips & Warnings
Try herbicides that contain pendimethalin or prodiamine. Both are usually safe for flower beds. Remember to check the label to ensure the product is safe for your flower varieties.
It is vital to allow time to asses any damage to the flowers in your small test area before you spread them throughout your flower bed.
