1. Different varieties: grapefruit is a small tree of Rutaceae with smooth branches, and grapefruit is a small tree of Rutaceae with small thorns distributed on its branches.

2. Different fruiting periods: grapefruit bears fruit every year10-1month, and grapefruit bears fruit every September-65438+February.

3. Different fruits: grapefruit skin is thin and grapefruit skin is thick.