Q.Indoor Gardenia
my Gardenia in a large pot has been outside and starting getting brown in the centre of the leaves which then fell off. The leaf is green edged with yellowish centre – I then brought it into the conservatory but the same thing is happening – the white flowers are perfect – please any advice? thank you.
Lack of humidity is most likely a key issue. Gardenia are very finicky plants.
Here is a few articles that will help you.
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-plant.htm
https://www.gardeningknowhow.com/edible/helping-a-gardenia-bush-with-yellow-leaves.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/when-to-prune-a-gardenia.htm