Host an Event Volunteer Join Tickets

Suppport 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
3 ratings

Thursday - June 26, 2008

From: San Antonio, TX
Region: Southwest
Topic: Invasive Plants, Non-Natives, Pruning, Trees
Title: Non-branching mimosa tree
Answered by: Barbara Medford

QUESTION:

I have a Mimosa Tree, just about 2 years old, grown from seed. The problem with it is that it has not branched out, it looks like one long branch growing out of the ground, about 5 feet if stood straight up. Is there anything I can do to shape like a normal Mimosa Tree?

ANSWER:

There are mimosas and mimosas. Two native trees that are called mimosas are Mimosa texana (Texas mimosa) and Desmanthus illinoensis (Illinois bundleflower). However, we're betting the one you refer to is Albizia julibrissi, a non-native of North America, instead native to an area ranging from Iran to Japan. All three are in the Fabaceae or pea family,but there the resemblance ends. At the Lady Bird Johnson Wildflower Center, we promote the use of plants native to North America because they need less fertilizer, water and maintenance growing in their natural habitats, and thus are better for the environment. The problem we had in trying to find the answer to your question is that most websites were more interested in getting rid of the mimosa than getting it to grow normally.

Plant Conservation Alliance Least Wanted Silk Tree.

USDA Forest Service Albizia julibrissin. The USDA Forest Service is usually at least neutral about non-natives but it doesn't have much good to say, and no information on how to make a single trunk branch.

But you didn't ask us to evaluate the value of your tree; you asked how to make it branch. Ordinarily, we would recommend pruning just below a bud area to promote growth of new branches. However, what you have now is a single leader, and most experts strongly advise against pruning leaders. You shouldn't even consider pruning now, in the heat of the summer, but wait until winter has cleaned off the foliage and permitted you to see the skeleton of the tree. By then, perhaps you will be able to see a branch radiating out from the leader that would make an acceptable crotch for the tree. This article from the University of Minnesota Extension on Pruning Trees and Shrubs seems to us to have the best diagrams and instructions for dealing with a young tree. You need to be aware that the mimosa is basically a weak tree, and a storm or even a strong wind could snap that thin leader in two. If that happens, we would advise you to start over with a stronger, native tree.

 

More Non-Natives Questions

Removal of non-native zoysia grass from Burgettstown PA
September 12, 2013 - What is the most effective method of killing zoysia grass? We bought a house that sits in the center of four acres of mature zoysia. It looks beautiful, however, despite our best efforts at "weeding...
view the full question and answer

Pronunciation of non-native mutabilis from Austin
April 11, 2010 - How do you pronounce the rose name, "mutabilis"? Some friends say "mu TAB ilis" and others say "muta BIL is". Which is it? Thanks!
view the full question and answer

Identifying problem with non-native plumbagos in San Antonio
November 21, 2009 - Barbara Medford answered my question on plumbagos..we have the ones that grow crazy in TX (not sure which species, but w/ the bright blue/purple blooms..). I have pictures and wasn't sure where to se...
view the full question and answer

Prairie remnant threatened by non-native Queen Anne's lace in Dallas
June 09, 2010 - A blackland prairie remnant is being invaded by Queen Ann's Lace. What are the best, least chemical, methods of getting rid of it without damaging the native grasses and wildflowers? Thank you!
view the full question and answer

Non-native, invasive mimosa trees in Vincennes IN
April 29, 2014 - I have 3 Mimosa trees here in Vincennes, Indiana and so far none of them are leafing out this spring (4-28-14) Do you think that this past winter could have killed then?
view the full question and answer

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