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
Not Yet Rated

Friday - July 04, 2008

From: Austin, TX
Region: Southwest
Topic: Non-Natives, Turf, Grasses or Grass-like
Title: Source for nitrates and phosphorus (P205) for lawn care
Answered by: Nan Hampton, Sean Watson, Julie Krosley

QUESTION:

I recently supplied soil samples from my back yard to my local extension here in Austin. I have a hybrid Bermuda turf grass (TIF 419) that has had its share of ups and downs, and wanted to assess the soil pH. They advised me to apply 1 lb. of Nitrate (N) per 1,000 sq.ft. every 6-8 weeks, and also to apply 2.3 lbs. of Phosphorus (P205) per 1,000 sq.ft. because the Phosphorus levels were very low. Where do I get pure Nitrate and pure Phosphorus? Home Depot doesn't sell it that way .. only in typical fertilizer bags where these elements are mixed percentages.

ANSWER:

So far, I haven't found anyone at the Wildflower Center who has ever bought and used the two products separately—they've always used a fertilizer mixture. It is possible that you could find these two, the nitrates and phosphorus (P205), at an agricultural supply store or at a landscape supply company such as John Deere Landscapes (with two locations in Austin). This company has a large number of fertilizer products and perhaps, if they don't have the pure products, you could find one with the correct ratio of nitrates to phosphorus. You need to realize that many of the fertilizer mixtures have been constituted to provide a gradual release of the chemicals and the pure products aren't likely going to do that—you risk causing chemical burns to your grass with the pure products. However, if you are intent on getting the pure products, you might contact the extension agent again since they recommended these products and probably know a source for them.

Alternatively, a couple of the members of our horticultural staff have suggested that you visit The Natural Gardener in Austin and take your soil analysis and recommendations with you. They might be able to offer organic substitutes for your lawn. Our nursery manager suggested that you could try topdressing with a compost/bone meal mixture to increase both nitrates and phosphorus. Compost does wonders for turf grass if applied liberally twice a year. Compost usually has a 1-1-1 ratio (N-P-K....a finished compost has little ammonium since it has been broken down into nitrate, thus, most nitrogen in compost is readily available for uptake by plants). Adding bone meal would increase the ratio of phosphorous to nitrate.

If your bermuda grass lawn continues to be a problem, we hope you will consider replacing it with a native lawn using Bouteloua dactyloides (buffalograss) in the sunny areas and perhaps a sedge lawn, groundcover, or wildflowers in shady areas.

 

More Non-Natives Questions

Salvia that needs dividing in Maryville MO
April 09, 2010 - I have some May Night salvia that is 3 years old. Last summer it split in the middle and spent a lot of the summer laid open. I'm wondering if it needs to be split or pruned in some way?
view the full question and answer

Problems with non-native Carrotwood tree in Toluca Lake CA
June 25, 2009 - My Carrotwood tree leaves are turning yellow and curling down, Why? Also due to a bad trim, the outer limbs are dying. Can you tell me what is wrong? It is an old tree and I would like to save it!
view the full question and answer

Search for non-native Rosa Rugosa for Granbury TX
November 12, 2012 - I would like to find an old fashioned Rosa Rugosa (non-hybrid) to grow in central Texas. I know I've seen them occasionally when traveling in the central TX area. I want them for their rose hips. ...
view the full question and answer

Abutilon or Podocarpus Toxic to Dogs?
March 17, 2016 - Are either of these plants toxic to dogs? Flowering maple or the Podocarpus henkelii shrub.
view the full question and answer

Reblooming Potted Iris
June 12, 2014 - I have a pot of iris bulbs that are giving me just a bunch of leaves this year. Last year I had wonderful big blooms. Any suggestions about what I could do to get some flowers?
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