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

Wednesday - July 29, 2009

From: Austin, TX
Region: Southwest
Topic: Watering, Trees
Title: Watering oaks during drought in Austin
Answered by: Barbara Medford

QUESTION:

Should we be watering our live oaks and Spanish oaks during this drought? How often and how much?

ANSWER:

There is no question that even old, well-established trees are going to need some extra help during the kind of drought we are having right now. There are several reasons this is so, as you will see in the Texas A&M AgriLIFE article Do Trees Scream Silently During Droughts?

This University of Illinois Extension website Dealing with the Drought affirms that watering even drought-resistant trees like the oak is essential. It points out that a 90 ft. oak tree will be a lot worse to lose than annual flowers or vegetables. We don't recommend watering at the base of the trunk, but watering farther out, with a hose or sprinklers, probably about every two weeks. An excerpt from this website will tell you why:

"Our 90-foot oak example could have roots at least 40 feet beyond the tree’s
drip-line. The same goes for most shrubs. So, apply water at the tree or
shrub’s drip-line, not at the trunk."

Those roots may be pretty deep, and part of the protection of the trees, but much of the root system is in the top 12 inches of the soil. So, putting the water out there helps to avoid fungus and rot at the base of the trunk. 

 

More Watering Questions

Copper Canyon daisy leaves turning yellow in Spring Branch TX
September 01, 2010 - My Copper Canyon daisies have grown well this year but the leaves are turning yellow. Any ideas?
view the full question and answer

Watering a Montezuma Cypress in Spring Branch, TX
July 11, 2013 - Live near San Antonio, and have a Montesuma Cypress, 15 ft tall. Great soil. Planted in April, should I keep it moist??? The foliage is getting brown.
view the full question and answer

Recently planted live oak tree in Boerne, TX
February 07, 2009 - My brother planted a live oak in August. It was from a nursery and had a root ball. It looks dead but I keep watering it. The trunk is about 6 inches around. The leaves died but when the winds came th...
view the full question and answer

Fungus gnats on house plant in Edwardsville IL
July 16, 2009 - I recently purchased a Trailing Perennial Plant, and I am seeing a lot of gnats flying in my house. Could this be the problem?
view the full question and answer

Shriveling and dying of non-native impatiens
July 14, 2008 - Several years now many of my impatiens after a month or so seem to shrivel up and eventually die. They are planted in a row and not all are affected. I am not noticing any slug evidence which I would...
view the full question and answer

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