En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

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
    
 
See a list of all Smarty Plants questions
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

Saturday - May 28, 2011

From: Lake Charles, LA
Region: Southeast
Topic: Invasive Plants
Title: Why is Water Hyacinth an invasive plant and Pickerel Weed isn't in Metarie, LA?
Answered by: Jimmy Mills

QUESTION:

Water Hyacinth. Would you please tell me why the Eichhornia crassipes (non-native) vs. Pickerelweed (native) is invasive vs. non-invasive? What are easy identifiers for these aquatic plants? Thanks and Regards, K

ANSWER:

Water Hyacinth and Pickerel Weed Pontederia cordata (Pickerelweed) are both aquatic plants in the Water Hyacinth Family (Pontederiaceae).  Although both have purple flowers, they are easy to distinguish by the arrangement of the flowers and the shape of the leaves. Click on each of the links below to compare these features.

Pickerel Weed 

  http://www.vplants.org/plants/species/species.jsp?gid=32287

  more images  

Water Hyacinth

   more images 

Pickerel Weed is a native plant and by definition is not considered to be an invasive species , although it is an aggressive grower. The Water Hyacinth, being introduced from Brazil in the 1880’s, is listed as an invasive species and is the more aggressive grower of the two. This can be attributed to the difference in their growth habit. The Pickerel Weed is an immersed plant, growing in shallow water (< 2 ft). It has roots and rhizomes that attach it to the  substrate, and is thus restricted to growth along the edges of ponds, lakes, and streams. The Water Hyacinth, on the other hand, is a floating plant that has spongy parenchyma tissue in the petioles of the leaves that serve as flotation devices, and fine roots that obtain nutrients from the water. With no attachments, it can quickly cover the entire surface of the body of water where it is growing. It also has a high growth rate (studies have shown that populations can double in as little as six days).
      

 

More Invasive Plants Questions

Getting rid of invasive Florida betony from Myrtle Beach SC
April 28, 2012 - How can I get rid of Florida Betony from my lawn and flower beds/ garden area. Garden area was thoroughly dug up and hand picked of all tubules last year at least a foot deep. They are much worse now....
view the full question and answer

Vine Choices Scarce in Beaverton Oregon
June 08, 2012 - Hi, I am looking for a hearty vine that we could use to cling to and cover a cement wall that is about 8 feet tall and 30 feet long. It is on the south side of our house but never gets direct sunli...
view the full question and answer

Name of the rough-barked mimosa (Albizia kalkora)
February 12, 2008 - I read two years ago that there was two different mimosa trees one that is common and has the smooth bark and the other one had a rough bark. I am Interested in the one who has the rough bark and the ...
view the full question and answer

Non-native invasive carrot wood tree losing leaves in Alpine CA
April 22, 2014 - My carrot wood tree is losing all of its leaves. The tree is about 15foot high & 13 years old. Could it be gophers? The tree was trimmed 1 year ago.
view the full question and answer

Affect of poisonous plant roots in soils for vegetables from Rusk TX
May 11, 2013 - I have a huge old flowerbed in front of my house that I want to plant veggies in, but I'm afraid to. It has a catalpa tree there, which I sell the worms from, but the entire tree (bark, leaves, flowe...
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.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center