Some have such hard outer shells that fire is needed to crack them open to allow moisture to seep in. Research indicates that the smoke from a fire also helps seed germination.
فبعض البزور لديها قشور خارجية صلبة جدا بحيث تكون النار ضرورية لشقّها لتتسرّب الرطوبة الى الداخل .‏