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

Thursday - July 01, 2010

From: Springfield, IL
Region: Midwest
Topic: Compost and Mulch, Soils
Title: What is composted mulch from Springfield IL
Answered by: Barbara Medford

QUESTION:

I love the look of hard wood mulch. It is my understanding that this wood mulch that is so readily available in bulk and bags is not "composted mulch". I have been told that this type of mulch pulls iron away from my plants causing them to look yellow. What exactly is composted mulch? Is there such a thing as composted wood mulch? I want the look that wood mulch adds to my trees and perennial beds. Thank you for your time.

ANSWER:

We agree, the look of shredded hardwood mulch is very attractive. It is of greatest benefit in that it protects the roots of your plants from heat and cold. When you put it into your garden, it will begin to decompose "in place" and become an enriching amendment to the soil. This is why you usually need to replenish mulch about once a year or so.

We can remember some discussion a few years ago about mulches pulling nutrients from the soil, but I think that was referring to chipped wood from tree trimmers. It is slow to decompose and does need some help from the material in the soil. We have personally nurtured a compost pile of mostly fallen oak leaves, of which we had a lot, adding water and cottonseed meal for nitrogen and stirring the pile for oxidation. It took at least a year to achieve the level of composting we liked, but we certainly used it as mulch. If you don't have the room or the inclination for a compost pile, you would be better to use the composted mulch you can purchase. However, we have also put 2 to 3 inches of commercial shredded hardwood bark on gardens with good soil and not felt any need to supplement the nutrients. 

This is one of those things that is as much personal taste in gardening as anything else. Read these two articles and form your own opinion. 

Agresource Using Compost as Mulch to Increase Soil Nutrient Level, Microbacterial Activity and Plant Growth. 

Bear Path Farm Compost as Mulch

 

More Soils Questions

Re-landscaping in Stephenville, TX.
November 17, 2012 - I prefer native plants. We are re-landsacaping, so I need grass, ground cover, vines and flowers to plant in our back yard. We have many trees and the whole yard is shady. A small area might be con...
view the full question and answer

Further information on soil pH for growing blueberries
December 31, 2008 - Thank you for your reponse to my question / comment. You were exactly right about soil pH. Here is what Clemson University Extension has to say about growing blueberries in North and South Carolina....
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

Soils for Acacia greggii and Bauhinia lunarioides
May 02, 2007 - What kind of soil do you recommend for anacacia tree? I was stunned by the one blooming at Center. I have had one for years and it has not been happy. I figure it must be the soil.
view the full question and answer

Yellowing leaves of Texas Sage (Cenizo) from Las Vegas NV
November 21, 2013 - Leaves of Texas Sage are turning yellow. Can you tell me why?
view the full question and answer

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