Satsumas take the lower temps.better . I planted grapefruit , satsuma , and naval orange first year I bought my house . All froze that winter . Satsuma came back but only made hollow fruit for 5 years . Cut it down . The other two sprouted back above the graft and were fine . Give them a while longer and if they come back remove any branches that don't sprout back...If they sprout back below the graft cut it down . All you will have is sour fruit.
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