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(b.) Moisture.

Wattles like a moderate amount of moisture, say from 18 to 20 inches. (F. Abbott.) Mr. J. E. Brown has grown wattles successfully with 10 inches of rainfall, but ordinary cultivators will not usually succeed with less than 16 to 20 inches per annum.

On the other hand, it is not good for wattle-trees to have an unlimited supply of water, as they then tend to throw out too much leaf, and the bark becomes flabby and deficient in tannic acid.

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