Host an Event Volunteer Join Tickets

Support the plant database you love!

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
Not Yet Rated

Wednesday - June 10, 2015

From: Pflugerville, TX
Region: Southwest
Topic: Invasive Plants, Herbs/Forbs
Title: Is Canna glauca invasive?
Answered by: Anne Van Nest

QUESTION:

How aggressive is Canna glauca? I'm interested in planting one near a gutter downspout, but I'm afraid it will crowd out groundcovers (heartleaf skullcap and fall obedient plant) in the two locations I'm considering. Can it be controlled?

ANSWER:

Canna glauca (water canna) is not overly invasive and can be controllled by keeping it in a pot and plunging it into the soil. The pot will keep the roots confined and which will restrict the growth and spread.

 

From the Image Gallery


Water canna
Canna glauca

Water canna
Canna glauca

Water canna
Canna glauca

Heartleaf skullcap
Scutellaria ovata

Heartleaf skullcap
Scutellaria ovata

Fall obedient plant
Physostegia virginiana

Fall obedient plant
Physostegia virginiana

More Herbs/Forbs Questions

Standing Cypress Plants in San Antonio, TX
June 26, 2013 - I purchased seeds for standing cypress 2 years ago and this spring they look beautiful. What is the best way to harvest the seeds? Also, will the current plants come back next spring or will I have to...
view the full question and answer

Wildflowers to complement Mexican hat in Texas
October 22, 2015 - We have 10 acres in Driftwood that has Mexican Hat pretty much everywhere that is not shaded. We are looking to add additional wildflowers to them in order to have color earlier and later in the seas...
view the full question and answer

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

Native orchids in Bowie and Harris Counties
July 02, 2015 - Hi Mr. Smarty Plants, I was wondering what types of orchids are native to Bowie County and Harris County.
view the full question and answer

Cedar sage not blooming in pots in Austin
September 14, 2012 - I have cedar sage (salvia roemeriana) in containers on a dappled-shade apartment patio in Austin, TX. This is their first season here, transplanted in May (it's now September). All the plants have be...
view the full question and answer

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