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 Pests Questions

New nursery plants with sappy spots from Round Rock, TX
September 09, 2012 - We live on the west side of RR, near Cedar Park and recently bought three 15 gallon cherry laurels from a nursery. Started to plant them today as we bought them a week ago and noticed base of the trun...
view the full question and answer

Insect infestation, identification and treatment
April 21, 2008 - help! I have an infestation of small flies in my flower/vegetable beds. They seem to be eating the leaves of just about everything. I've tried to find out exactly what they are, but haven't had any ...
view the full question and answer

Worms in non-native snake plant from Hillsborough NC
September 17, 2011 - I purchased a snake plant this summer for my screened in porch. I did not repot it and left it in the plastic pot in came it. I was about to repot the plant to bring it in and noticed there are worm...
view the full question and answer

Problems with rusty blackhaw viburnum in Austin
May 07, 2010 - I have a four foot rusty blackhaw viburnum. Last summer the leaves turned reddish and in the late summer most of them fell off. This February the plant started to leaf out and then bloomed. It has ...
view the full question and answer

Cause of yellowing buffalo grass (Bouteloua dactyloides)
June 07, 2008 - We are getting large yellow areas in our buffalo grass lawn and think this is probably due to grub worms. Are grub worms the likely culprit and if so, what is the best way to get rid of them? We don...
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center