How to prevent plant yellowing

By Tom Dominguez

Yellow plants?
If you have trees, shrubs, flowering plants or lawns that are persistently yellow, it could be an iron deficiency.
Iron deficiencies are caused by high soil pH, too much water, root or trunk damage, poorly adapted plants or excess soil nutrients such as phosphorous.
Iron deficiencies are identified by yellowing between the leaf veins on the newest growth of the tree or shrub. This is called interveinal yellowing or chlorosis. The veins often remain green. In extreme cases the leaves can be completely yellow and showing signs of leaf scorch on the edges.
An easy test to see if iron deficiency is actually the problem is to take a handheld spray bottle and fill it with a liquid iron product.
Iron sulfate (1 tablespoon per gallon of water) or iron chelate mixed in water along with a tiny drop of surfactant. Select and spray a limb or section of the plant or grass. If it is an iron deficiency it will green up in 24 to 48 hours. Now that you’ve identified the problem you can remedy with the appropriate action.
In general, all over yellowing or poor color could be an indication of nitrogen. On some plants the oldest leaves will turn yellow and the new growth will be green.

Late Summer Color
Petunias, marigolds, pentas, scarlet sage, zinnia and periwinkle can be set out and will be blooming before you know it.
These will provide excellent color in your landscape until the first freeze. Be sure to pick healthy, young transplants for the best results.

Invite to pecan seminar
I would like to invite all Pecan enthusiasts to come check out the First Annual Tucumcari Pecan Seminar on Oct 4. Call us at 461-0562 for more information.

Tom Dominguez is an agent with the Quay County Extension Servcie. To contact him call 461-0562 or email