En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Best fertilizer for live oak trees in Central Texas

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
1 rating

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 Soils Questions

Deer resistant plants from New Braunfels TX
August 31, 2012 - I have a 1/2 yard covered by a tree, shady. Bermuda grass previous owner planted has all turned brown this summer. I don't have lots of money to work with but would love to landscape that side of fr...
view the full question and answer

Brown leaves on Burr Oak from Dripping Springs TX
October 05, 2013 - We have recently planted a 15 gal. burr oak in an correct hole with great soil and plenty of watering in. We have noticed some brown leaves. Should we be worried?
view the full question and answer

Non-flowering plants in Scottsdale AZ
July 01, 2013 - I have three plants that are supposed to do well in Arizona but mine are not flowering. The yellow bells and orange jubilee I have get full sun, drip watered 3 x a week for 1 1/2 hrs (at 4am) and are...
view the full question and answer

Failure of highbush blueberry plant to produce in New Hampshire
July 25, 2008 - One of my highbush blueberry plants completely stopped producing. What can I do to revive it?
view the full question and answer

Plants to grow in high zinc, lead and copper soil in Los Angeles
January 24, 2011 - We live on the Westside of Los Angeles and have just been given the bad news that our beds are high in zinc (86.39), lead (45.98) and copper(12.95). Can you recommend some plants that may grow in thes...
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