SOIL TEST INFORMATION SHEET NO. H-860

Prepared by Extension Horticulturist Allen D. Owings
	
Shrubs

1.	The recommended pH range for the majority of shrubs grown in Louisiana landscapes is 5.5-6.5.  Shrubs that prefer a pH range at the lower end of this scale are referred to as acid-loving (examples: camellias, gardenias, azaleas, wax myrtles, hydrangea).  Other shrubs will l grow best at the upper end of this pH range.

2.	Shrubs are generally fertilized once per year. This should be done during late winter or early spring (March-May).  Evenly distribute the fertilizer under the spread of the plant and “water in “ if the soil is dry.  Avoid fertilizer placement next to the stems or shoots of the shrubs.

3.	Select a slow release fertilizer and apply fertilizer at the rate of 1-2 pounds of nitrogen per 1000ft2 of landscape bed area.  Camellia and azalea fertilizers are good to use also.  Avoid using 34-0-0 (ammonium nitrate) in shrub fertilization.  Other fertilizers, such as 8-8-8 or 13-13-13 can be used, but it is best to utilize slow-release types.

4.	Unless phosphorus and\or potassium levels are inadequate in the soil (as determined by a soil test), use a complete fertilizer with a 3:1:2 or 3:1:3 ratio (e.g. 12-4-8 or 15-5-15).  A 3:1:2 fertilizer contains 3 parts nitrogen, 1 part phosphorus as P2O5, and 2 parts potassium as K2O.

5.	Foliar applications of iron or application of a slow release granular iron fertilizer, such as Ironite, can correct foliar iron nutrient deficiencies.

6.	Raise soil pH to a recommended level with the addition of dolomitic limestone or agricultural limestone.

7.	Lower soil pH to a recommended level by adding aluminum sulfate or elemental sulfur.

8.	Contact your county agent for additional information and help in your fertilization program.  The agent also receives a copy of this report for the parish office files.