En Español

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

Saturday - May 16, 2009

From: Colorado Springs, CO
Region: Rocky Mountain
Topic: Non-Natives, Compost and Mulch, Soils
Title: Is cement leaching into flower beds in Colorado Springs?
Answered by: Barbara Medford

QUESTION:

I have posed this question to a number of garden centers in our area around Colorado Springs--only to rec. a repeated--"Gee, I don't know." When we moved to our new home there was a rock concrete wall terracing the front yard. I planted iris and day lilies at the base of the wall. They had thrived at our former home for a number of years and I am very fond of them. The wall was built by the former owners and not totally finished nor sealed on the top. The rock are cemented around a core of concrete blocks. The first summer both lilies and iris bloomed well. The past two summers they have become increasingly smaller in size, definitely fewer and smaller blooms. I have checked for grubs, bugs--feed bone meal. The bed has a soaker hose and mulch--yet they are not too wet or too dry. We purchased compost and dirt to finish terracing and landscaping. Iris and plants five feet away are thriving. Is is possible that the concrete is leaching into the soil and stunting the growth of the plants at the base? I realize that this is not a "native plant" question, but I am totally perplexed and frustrated. I have found your site to be highly interesting and very helpful as we have a large area of land north of the Springs we are attempting to return to a more natural landscape with grasses and wildflowers. Any thoughts would be greatly appreciated.

ANSWER:

You are correct, cement leaching is way out of our field of expertise. The flowers you are referring to are not even natives of North America, and/or are so extensively hybridized that we would not be able to identify their ancestry. And you should remember that when you ask questions in a nursery, especially one not completely plant-related such as this one, that is not in their range of expertise, either.

We're going to offer you some alternative solutions, and perhaps you can work out what your problem is. Are they in sun or shade? We believe both the plants you are referring to are sun plants. Do they have heavy mulching over their roots, or rhizomes? Iris, in particular, can rot if their rhizomes are heavily covered-they need some air. 

Since you say some of the same plants a few feet away are doing fine, we would suggest you simply move the plants you are concerned with. That will give you time to try to solve the problem without sacrificing plants you wish to save. If they suffer from transplant shock, this is not going to help them, but likely won't kill them. Just trim off any foliage that is looking bad and replant in a more suitable place.

Now, to find out what the problem is with the wall. You need to know what is going on with the soil; perhaps in the process of building the wall, some toxic material got into the soil that is now making itself felt. You can get materials and instructions for getting a soil test by contacting the Colorado State University Extension Office, El Paso County. Dig down in there, see if you can find rubble or powdery material that looks like it doesn't belong.

And, finally, we Googled on "concrete leaching into soil" and got a number of references. One that we followed up briefly said concrete always leaches some lime. If this is the case, you can try neutralizing it with something that is naturally acidic, such as pine bark mulch or compost. We would suggest you continue to pursue that line of inquiry, starting with the concrete, and  follow up leads on the Internet.

 

More Soils Questions

What to do with soil left over from new driveway in Austin
January 07, 2011 - When we had a new driveway put in in Mid-December, the topsoil and weedy grass was scraped into a low pile. I watered it and covered it with black plastic to kill all the plant matter. How long should...
view the full question and answer

Tolerance of rosa setigera of acidic soil from Cobden IL
October 20, 2012 - How tolerant is Rosa setigera of acid soil? I would like to plant it in my (very large) garden but the loess soil has a pH of 4.5. Thank you.
view the full question and answer

Nassella tenuissima for Woodland Hills CA
June 30, 2013 - Good afternoon, I wanted to purchase some already grown Mexican Feather Grass (Nassella tenuissima) and was wondering how often and for how long I would need to water said grass on a scheduled sprinkl...
view the full question and answer

What can be planted under a pine tree in Detroit, MI?
April 22, 2008 - What type of plant would you suggest I plant under my big (Blue bruce) pine tree? It's about 25 ft high and the branches are trimmed to about 4 feet up, so it does get some light but mostly shade.I a...
view the full question and answer

Proper soil for Blackfoot daisy (Melampodium leucanthum)
April 18, 2006 - I live in San Antonio. Have taken landscape course at the center several years ago-(fabulous)! I am putting in a raised portion of the garden this year with Blackfoot Daisies. Can you tell me where...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center