Following proper fertilization practices is clearly important. Late fertilization will delay the hardening process. Brambles and blueberries should not be irrigated after mid-September unless under severe drought stress. Planting a cover crop around these crops helps remove excess water and nutrients from the soil to plants properly harden. Carbohydrate status is also important.
Plants entering the winter with a shortage of stored carbohydrates are more susceptible to injury.
Proper pruning allows plants to receive more light, allowing for more carbohydrate production. The important fall practice is mulching. Mulch helps prevent soil heaving in newly planted blueberries. However, don't apply mulch too early. Wait until low temperatures have been sustained for at least 3 nights.