Answer: Holly berries mature at different times (depending upon the cultivar you're growing). Typically they start out green, change to an orange and finally turn red. Usually cold weather will help ripen the berries and most turn red by mid-December. The brown berries may be leftovers from last year and the green berries just haven't yet matured. Perhaps the other hollies get more/less sun, water, fertilizer than yours and that's why they've matured faster than your holly. Give your plant a bit more time and I expect the berries will turn red.
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