Very sad tree peony
Back in April we bought a small tree peony for our border. It hasn't done a thing since it was planted! Its exactly the same size and has had no new growth; it's like it's in stasis. It did appear to have powdery mildew on the leaves within a month of planting it so we sprayed with a anti fungal treatment but the poor thing has done nothing.
The border recieves sunlight but also shade, which should have been fine according the plant tag. It's now looking a bit crowded and needs moving (it had lots of space for several months). We want to give it one last shot at a full and happy life (!) so want to move it but we aren't sure where too.
Should we move it to another border that recieves more sun or should try and plant it in a decent sized pot?
Any help or advice much appreciated.