Rent Shop Volunteer Join

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
1 rating

Saturday - September 03, 2011

From: Anchorage, AK
Region: Northwest
Topic: General Botany, Invasive Plants
Title: Have invasive plants no useful purpose from Anchorage AK
Answered by: Barbara Medford

QUESTION:

Does the definition of invasive plants include that the plant has no useful purpose? Thanks.

ANSWER:

Please read our How-To Article When is a Guest a Pest? which covers the things we would say about invasives.

The problem then is to define a "useful purpose." While some of our invasives are native that have gotten ahead of other plants due to environmental conditions, most invasives are non-native or alien. Some were stowaways on ships, some were seeded by birds or strong winds, or have gradually spread from connecting parts of the continent. Most, however, have been deliberately brought here for specific purposes, "useful" purposes in the eye of the conveyor. For instance:

The Amazing Story of Kudzu

Previous Mr. Smarty Plants answer-King Ranch Bluestem

The United States Arboretum - Invasive Plants

Plant Conservation Alliance's Alien Plant Working Group LEAST WANTED - Bastard Cabbage

On the other hand, to be the Devil's Advocate, let's consider photosynthesis. From a previous Mr. Smarty Plants answer: "When sunlight strikes a leaf, a process called photosynthesis is put into play, the plant converts the energy from the sun, combines it with water and nutrients in the plant, and metabolizes it into food to support the plant, form new structures within the plant, and store food in the roots. Along the way, it releases oxygen, which is a good thing for the human race. The plant uses carbon dioxide, not good for breathing in the process, and releases much needed oxygen as a waste product!" How cool is that? From sunlight and photosynthesis the whole food chain of Nature is begun. This happens in native plants, alien plants and invasive plants. It's hard to call a plant useless. It may be irritating, poisonous, ugly, intrusive, but it is still feeding all the lifeforms and providing oxygen.

 

 

 

More General Botany Questions

Fragrant Texas wildflowers
April 10, 2013 - Hello! I am researching native Texas wildflowers and I am looking specifically for flowers with a pleasing aroma. Is there anyone who has made a list that includes how the flowers smell? Do you kno...
view the full question and answer

Half-life of the insecticide imidacloprid
March 07, 2011 - How long do systemic insecticides such as imidacloprid (Merit) remain active in nursery grown plants? Asclepias curassavica (tropical milkweed)is frequently grown with imidacloprid to prevent...
view the full question and answer

Forestiera pubescens blooming in July
August 07, 2012 - I have a lot of what appears to be Forestiera pubescens. They are covered with the dark blue/black berries and flowers. Apparently they are blooming again in the middle of July. I live about 35 mile...
view the full question and answer

Can users sort plant lists in the Plant Database?
November 17, 2008 - Although your database searches are very useful, I would like to take it further, for example by sorting the "Central Texas Recommended" list on various columns, as you might do in a spreadsheet. D...
view the full question and answer

Increase in plant cell size when nuclei take on water
March 07, 2008 - Do plant cells increase in size when vacuoles or nuclei take on water?
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.