That's the only way to rule out a mineral deficiency as a cause of poor growth. This can be done at a cooperative extension office or a private laboratory. Look in the yellow pages under "Soil Testing.
If the soil becomes very alkaline, your plant may develop a mineral deficiency condition such as chlorosis - an inability to take up iron - causing new leaves to be stunted and yellow.
On the program we were shown by Peter a slight mottling on a shrub's leaves which indicated a mineral deficiency. However, further reference should be sought on determining types of element deficiency (see below).
 See also: Plant, High, Water, Deficiency, Alkaline
  
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