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

Friday - March 10, 2006

From: Bowie, TX
Region: Southwest
Topic: Wildflower Center
Title: Information on green roof demonstration site at Wildflower Center
Answered by: Nan Hampton and Mark Simmons

QUESTION:

I visited your green roof demonstration site and am interested in putting a green roof on a structure. There seemed to be at least two layers of growing medium in the planters; one layer looked like rounded pumice or rounded brick fragments and I believe it was below the drip irrigation lines and the other looked like a growing medium. Could you explain what each layer does and where I could get the stuff in bulk?

ANSWER:

Our expert, Mark Simmons, thinks the layers you are referring to are merely the gravitational settlement of the media (synthetic soil) following rain events. The composition of each of these media is proprietary; however, contacting the suppler Siplast may help. We are in the process of creating more infomation about this experiment as it gets set-up over the the next month or so. If you haven't seen it already, please visit our Green Roof Gardening page.
 

More Wildflower Center Questions

Souce for Glass Mulch in Austin
September 02, 2015 - Is there a special reason that broken glass is used in the courtyard flower beds? It's beautiful, wondering where to purchase some.
view the full question and answer

Location of Elbow Bush and Gregg's Saddlebush at the Wildflower Center
March 10, 2016 - I have twice looked for Forestiera pubescens (Elbow Plant) and Mortonia greggi (Gregg's Saddlebush) in your gardens and have been unable to find. I have looked on the trails as well. Would you be a...
view the full question and answer

Potting soil used in Wildflower Center nursery
October 23, 2008 - I recently purchased several beautiful little plants at your Fall plant sale and notice how very happy and healthy they all are! Please tell me if you mix your own potting soil and what your potting ...
view the full question and answer

Source for Signs at the Wildflower Center
January 24, 2011 - Hello. Where can we buy the black, metallic plant identification tags used at the Wildflower Center? Thanks in advance.
view the full question and answer

Ways to learn more about native plants of region
March 20, 2004 - How can I learn more about the native plants of my region?
view the full question and answer

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