Rowan and Oak Trees Indoors – Dormancy Requirement

Deciduous Trees Need Winter Cold

A rescued 4 ft rowan and 6 ft oak are to be replanted indoors in a warm, well-lit atrium in Scotland. The owner asks if lack of winter cold will harm them.

Dormancy Is Essential

Rowans and oaks are deciduous; they require a cold dormant period to rest. Without it, they exhaust their energy reserves, grow weakly, and eventually die or succumb to disease. Only evergreen oaks (e.g., Southern Live Oak) can grow year-round without dormancy.

Recommendation

These trees must be planted outdoors where they experience natural seasons. An indoor atrium cannot provide the required chilling hours.