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Richard from Dalton Gardens, Id writes

Will Tenacity Herbicide kill yellow iris around my pond?

Digging iris does not rid my pond or area of it. It is now a weed and I tried roundup but it wasn't effective.

Answer:

Tenacity is not labeled to control undesirable ornamental plants, although it may harm them if sprayed accidentally. You will need to remove physically all the parts of the iris - including the rhizomes in the soil – in order to prevent these plants from regrowing the following year. You can use a glyphosate product such as RoundUp QuikPro to kill the above ground plants, but you will need to remove the rhizomes after spraying. This article has easy-to-follow directions on this treatment, which is best done in the fall.

Answer last updated on: 10/30/2019

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Tenacity Herbicide

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