Why Is My Holly Losing Its Berries?
Holly usually drops berries because of drought stress while the fruit is forming, a sudden change in growing conditions, or hungry birds stripping them in late winter. Consistent watering through summer and fall is the best way to hold a berry crop.
A holly shedding its berries prematurely is most often a plant under stress. Drought is the usual culprit: a female holly short of water while its berries are sizing in late summer will often abort the crop to conserve resources. Consistent, deep watering through a dry summer and fall is the single best way to keep the fruit on the plant.
Sudden change also triggers drop. Transplant shock, a hard early frost, or a swing from wet to dry can all cause a holly to release its berries. Newly planted or recently moved hollies are especially prone to it while they settle in.
Finally, remember that berry loss in late winter is often simply birds doing their work — cedar waxwings, robins, and mockingbirds can strip a holly in days once other food runs short. That is not a problem to fix but one of holly's quiet benefits to winter wildlife.