Contact Us Host an Event 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
3 ratings

Thursday - November 04, 2010

From: Austin, TX
Region: Southwest
Topic: Compost and Mulch, Soils, Trees
Title: Do leaves with tannins make good compost from Austin
Answered by: Barbara Medford

QUESTION:

I have a couple of old native pecan trees in my (or neighbor's) yard that drop bushels and bushels of leaves every fall. Somewhere in the back of my mind, I have a recollection that pecan leaves have too much tannin (or something else) to make good compost. Was I dreaming? Now that I am composting everything I can lay my hands on, should I throw the pecan leaves in the pile? Thanks!

ANSWER:

First, congratulations on your composting practices; nothing is better for the environment, in our opinion. Second, there are always arguments about what is okay to compost and what is not. We found this comment from an article by Neil Sperry for the Wichita Falls, TX Times Record News:

"Leaves of oaks, pecans and walnuts all contain tannins, and there are always those out there who contend that you should not include any of these in your compost piles or in your garden soils. Let me answer from my personal experiences. I grew up in College Station, where I used post oak humus as my main source of organic matter in my gardens and greenhouse soils. It was naturally composted beyond recognition of its origin, so the tannins were of absolutely no concern. For the past 32 years, I have lived and gardened at the floor of a pecan forest, and I’m knee-deep in pecan leaves every fall. I run them through the mower, compost them, and proudly use them without any repercussions at all. Two pieces of advice: Use your mower to speed the composting along, and include other forms of organic matter in your compost pile. Decaying manure, grass clippings, “scalpings” from your first lawn mowing of the spring, etc. A combination of several forms of organic matter is always a better idea than having only one."

The message here is compost early and often and long enough to do the job. The organic matter mentioned in the excerpt contribute nitrogen and help in the "heating up" part of composting. If you don't have enough "green" material, you can buy a bag of cottonseed or alfalfa meal at the feed store, and layer your leaves with that, remembering to moisten the pile and keep turning it. By all means, don't waste those leaves!

 

More Soils Questions

Non-flowering plants in Scottsdale AZ
July 01, 2013 - I have three plants that are supposed to do well in Arizona but mine are not flowering. The yellow bells and orange jubilee I have get full sun, drip watered 3 x a week for 1 1/2 hrs (at 4am) and are...
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

Evergreen, deer resistant privacy screen for Villanova PA
March 29, 2013 - Looking for something that is deer resistant and ideally evergreen to block a shed and fence that my neighbor recently installed. Live in Eastern PA. Not the best drainage and also shade for most of...
view the full question and answer

Limp leaves on Texas purple sage in Magnolia TX
July 22, 2010 - Recently planted Texas purple sage, some of it looks healthy and has new blooms, but a few of the plants have limp leaves and are thin at the bottom. I read the article on cotton root rot, but am not ...
view the full question and answer

Native flower bed with part sun
December 05, 2008 - I have recently put in three small flower beds and replaced the hard clay with decent dirt. The site is shaded in the AM but mostly sun in the PM. I would like to plant natives - what can you recommen...
view the full question and answer

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