Explore Plants

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 

Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.

rate this answer
1 rating

Tuesday - August 29, 2006

From: Salem, OR
Region: Northwest
Topic: Invasive Plants, Problem Plants
Title: Disposal of bulbs to control Arrowhead aquatic plant
Answered by: Nan Hampton

QUESTION:

How can I kill Arrowhead permanently? I have sprayed repeated years with Roundup, Crossbow, etc., but the arrowhead comes back from the bulb the next year!

ANSWER:

Short of importing flocks of ducks to eat the "potatoes", the most effective way to control arrowhead (Sagittaria sp.) is dig up and dispose of the bulbs along with the plants. Depending on how large your lake or pond is, you might consider removal by machine. Chapter 5—Aquatic Plant Management Techniques—in Aquatic Plant Management In Lakes and Reservoirs (prepared by the North American Lake Management Society and the Aquatic Plant Management Society) describes mechanical removal and other control methods for problem aquatic plants. Since arrowhead must be rooted in relatively shallow waters another solution is to eliminate the shallow water areas by mechanically increasing the depth at the edges of your pond. There are also dyes that you can add to the water to decrease available sunlight to plants growing in the water, thus limiting their growth.

 

More Problem Plants Questions

Killing oak sprouts from El Paso TX
August 16, 2011 - I want to know how to kill oak root sprouts and seedlings. Very dense and out-of-control in huge area of front lawn. I had tree cut down and I still cannot get rid of them. They're only getting wors...
view the full question and answer

How can I eradicate Mexican Petunia from my garden in Vacaville CA?
July 02, 2009 - Can you tell me the best way to eradicate the plant Ruellia, commonly known as Mexican Petunia, from my garden?
view the full question and answer

Male or female Jatropha curcas from Brownsville TX
August 16, 2012 - How do know the sex of a young Jatropha C. plant? how many weeks before you can tell a boy/girl plant ?
view the full question and answer

Eliminating agave roots in Tonto Basin AZ
April 22, 2009 - Greetings Mr. Smarty Plants, from Tonto Basin, AZ! We have numerous mature (huge!) Agave Americana plants here, and have, until recently, enjoyed them. However, we are now ready for a drastic landscap...
view the full question and answer

Eliminating unwanted vine on arbor in San Francisco
November 20, 2012 - There is a vine growing on our arbor, it has sickle-shaped pods and is crushing the arbor, how do we get rid of it?
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.