Aquacide — Aquatic Weed Control: 3 Tips for Watercress Removal

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Aquatic Weed Control: 3 Tips for Watercress Removal

Published by Tom Markoe on November 14, 2013 0 Comments

Watercress (nasturtium officinale) is native to Eurasia, imported to the U.S. as a spicy cooking herb.  It is a healthy low-calorie vegetable that when neglected can be a problematic invasive weed. 

Watercress is an emersed weed found in shallow areas near the shoreline.   It has alternate leaves with the end leaf not paired and a cluster of white 4-petaled flowers that rise above the top of the weed.

Cutting only makes the problem worse.

1)      Dig up Watercress root and all before it begins to flower.  Remove weeds to an area away from shoreline and allow it to dry.

2)      2,4-D herbicide is a systemic option that is best applied early spring at the first sign of new growth prior to seed.  This option will kill the entire weed root and all.  Repeat treatment may be needed 3-5 weeks after the first application if weeds begin to show signs of recovery.

3)      Glyphosate herbicide is a systemic option that is best applied mid-season when growth is above the water level and in full bloom.  This option will kill the entire weed root and all.  Again, repeat treatment may be needed 3-5 weeks after the first application if weeds begin to show signs of recovery.

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