I see you live in Australia. So when you say it is cold, how cold? Hydrangeas go dormant in winter so I'd say this is perfectly normal for your area of the world.

I would move it back outdoors in a morning sun setting and let nature do its thing. Don't forget to keep it moist even while dormant. I see it has set its terminal buds for the next growing season.

Thank you for your reply, Im in Adelaide and it's pretty much been under 15 degrees here every day for weeks. Weve been lucky to get a couple of days of sun but pretty much just cloudy and rainy every other day. The soil is still damp and have watered it a couple of times since its been inside.

Thank you for your reply, Im in Adelaide and it's pretty much been under 15 degrees here every day for weeks. Weve been lucky to get a couple of days of sun but pretty much just cloudy and rainy every other day. The soil is still damp and have watered it a couple of times since its been inside.

Jamie, 15...is that Celsius then? So approximately 60F, not particularly cold for the beginning of winter and certainly not for hydrangea. Length of daylight hours factors into the winter dormancy too, not just cold. Your hydrangea is a deciduous plant and should be expected to lose leaves in winter - in a mild climate at least some of them. Your plant will be happier/healthier outdoors than in your house, take it back outside.

Ah,, 15 C? That would be a pleasant 59 F here. Keep it moist but not sopping wet during its dormancy.

My hydrangeas survive outside during winter up to - 40 ðC (with windchill) so 15 ðC will be more than okay. Keep it outside!

Thanks guys ok I will take it back outside.