One of the first things necessary in growing protea is soil. Protea plants must have well-drained soil. Their roots grow mostly horizontally, just below the surface of the soil. If water is allowed to sit and pool on the surface, the roots will become waterlogged and the plant will die.
Proteas can stand a range of temperatures, from 23 F. to 100 F. though they may not survive long exposure beyond that.
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