En Español

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
4 ratings

Thursday - April 22, 2010

From: Waco, TX
Region: Southwest
Topic: Compost and Mulch, Soils, Trees
Title: Best fertilizer for live oak trees in Central Texas
Answered by: Barbara Medford

QUESTION:

What is the best fertilizer for live oak trees in Central Texas?

ANSWER:

Our vote would be "none." One of the big reasons for using plants native to North America and to the area in which they are being grown is that those natives are already acclimated by millions of years to the soils, climate, temperatures and rainfall in their area. We always recommend that the soil be checked, especially in terms of drainage, as most trees do not do well with wet feet, and too much moisture without sufficient drainage can cause rots and fungi to move in. We do like to see compost or other organic matter worked into the soil in the area where a tree is going to be planted, and not just the hole. As those trees get bigger and the roots move farther out, good soil with the amendments will help them to continue to grow. There are experts who recommend no amendments to the soil at all, because when the roots of the new tree begin to get out beyond their original hole, the real world, or the dirt thereof, could be a terrible shock. This is personal choice, but we like to give little trees a boost, partucularly in the alkaline clay soils of Central Texas.

Here is another take on that from a previous Mr. Smarty Plants answer:

"A standard fertilizer should be fine. One landscaper I interviewed advised an 8-2-4 compost-based fertilizer, meaning 8% nitrogen, 2% phosphorus, and 4% potassium. Others weren't so specific as to proportions, saying only "standard" or "regular."

All my informants said that if the tree is a naturally occurring specimen that has survived on its own without human intervention and still looks good, nothing may be needed. However, if the tree is now surrounded by new construction that may have damaged its roots, a fertilizer with significant phosphorus for root growth will help it adjust. Significant phosphorus will also be needed if your tree is a newly planted purchase that you want to encourage to spread its roots beyond its root ball.

All said that surface applications are best. Spread the fertilizer from near, but not on, the trunk, to a foot past the extent of the leaves.

A couple of friends of mine have maintained beautiful live oaks for two decades with little more than compost applied two or three inches thick from near the base of the tree to just past the dripline.

A deep, slow, soaking watering just after you fertilize will insure that the nutrients get to the roots. Doing it just before a good rain is even better.

Whatever you use should be applied once or twice a year. The most important time to fertilize is in early spring, just before new foliage appears, to help fuel the new growth. Though considered evergreen, live oaks (Quercus fusiformis, Quercus virginiana, or hybrids between the two) actually lose all their leaves in early to mid-spring, but the new growth appears about the same time that the old leaves drop, so most trees never look bare.

A second application in early summer can help fortify the tree during the harsh Central Texas heat."

So, take your pick; the point in both of these answers is that Nature is already doing a good job, you can give Her a little boost if you wish. 

 

 

 

More Trees Questions

Need suggestions for trees to withstand high winds on Top Sail Island, North Caroloina.
August 20, 2013 - Moving to coastal southern North Carolina. Planting native trees and shrubs, wax bayberry, Redbud, love the River Birch. What type of tree has the deepest roots or would be least likely to blow over...
view the full question and answer

Distance apart to plant oaks in Denton TX
August 26, 2009 - How far apart should I plant Pin Oaks and Shumard Red Oaks in our yard? All around us are native oaks, but our backyard has none. I want to create a "forest" that looks like they are native, but n...
view the full question and answer

Dying branches on Texas Mountain Laurel from Kempner TX
September 14, 2012 - The branches on my Texas Mountain Laurel are very dry and brittle. The leaves are also starting to die. The tree has been in my yard for six years and prior to that it sat wrapped in burlap for ov...
view the full question and answer

Is post oak resistant to oak wilt from Dallas TX
November 22, 2013 - I am confused. The NPIN website says that Post Oak IS susceptible to oak wilt, but all the other information I have been able to find says that it is resistant to oak wilt and rarely gets the diesase....
view the full question and answer

Need for sunlight for Sophora secundiflora to bloom
June 22, 2007 - My mountain laurel doesn't bloom. We live in Oak Hill and planted it about seven years ago. It bloomed one year at about age three or four. Since then nothing. What can I do? It only gets indire...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center