En EspaŅol

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
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
Not Yet Rated

Sunday - March 30, 2008

From: Austin, TX
Region: Southwest
Topic: Pests, Propagation, Trees
Title: Vehicle friendly oak trees for Austin
Answered by: Barbara Medford

QUESTION:

Do Chinquapins, Shumards or Live Oaks produce lots of tree sap? I'm looking for a vehicle friendly Oak tree to be installed in parking areas in Austin, Texas.

ANSWER:

Quercus fusiformis (plateau oak) is evergreen, while Quercus muehlenbergii (chinkapin oak), and Quercus shumardii (Shumard's oak) are deciduous. Actually, Live Oaks do drop a third to a half of their leaves, usually in the late winter, every year, but they are smaller and more easily dealt with, plus you have the advantage of the trees being green year-round, which you won't have with the others. All three trees are native to Texas and, therefore, good selections for Austin.

In terms of tree sap, almost all sap falling or dripping from trees is the product of insects, most often aphids. Generally, this aphid damage is not enough to cause problems for cars parked under them. There are other, more serious insect infestations that can cause sap to be exuded. The worst of these does not just cause irritating dribbles on the cars, but can quickly kill the tree. Of the trees you asked about, only Quercus fusiformis (plateau oak) is a live oak. Live Oaks are more susceptible to oak wilt than the others, which should definitely be a consideration in your choice. This link to the Texas Oak Wilt Information Partnership will give you some valuable advice on oak wilt. Please take note of the information on that site, and, if you decide to plant live oaks, to make sure the proper cultural practices are observed in caring for them.

By, the way, all oaks bloom in the spring, and put out a fine dusting of green pollen. Not only is this an allergen for many people, but it's also pretty irritating on paving, walks and cars.


Quercus fusiformis

Quercus muehlenbergii

Quercus shumardii

 

 

More Propagation Questions

Germination and propagation of bluebonnets
April 25, 2005 - I live in Austin. Last fall I spread a load of dirt on my lawn to provide soil contact for the 2 pounds of bluebonnet seeds I subsequently spread (this was in early November). The germination rate a...
view the full question and answer

Non-berrying possumhaw from Austin
June 05, 2014 - I planted a possumhaw 8 to 10 years ago for the beautiful winter color, it has never set berries. I see tiny white flowers along the branches each spring, and always hope this will be the year, but I...
view the full question and answer

Propagating Indian Paintbrush
August 17, 2008 - I live in Pecos, NM and have a lot of Indian Paintbrush plants growing wild on my road. I wonder if you can tell me how I can propagate this plant.
view the full question and answer

Crossbreedding of Lupinus polyphyllus and L. perennis
June 25, 2007 - Hello, can Lupinus polyphyllus and L. perennis crossbreed? I have both and want to keep perennis genetically pure, is the only way to do this is to get rid of the polyphyllus?
view the full question and answer

Reproducing Echinacea 'Sunbeam' from Powthan VA
August 03, 2011 - I would like to reproduce a flowering plant- Sundown echinacea. I have a plant now. Can you give me info on how to do it? thanks so much.
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center