Q.Blueberry in a pot – Big Blue Blueberry
Hi, I bought a blueberry plant last month and picked a type for container gardening – Vaccinium coryb. ‘Jolly Berry Big Blue’. I planted it in a medium size pot with acidic soil and it’s placed on my windowsill where it gets a lot of sun (I have a south facing balcony and I live in a warm climate).
I am worried because so far the plant hasn’t grown many leaves – as you can see in the picture, it looks like a stick with a few leaves on it.
Can you offer some advice?
Thank you!

Make sure your plant is in full sun for most of the day.
Avoid overwatering. The roots are shallow and will not do well with soggy soil.
Make sure the soil is well draining.
https://www.gardeningknowhow.com/edible/fruits/blueberries/grow-blueberries-in-pots.htm
https://www.gardeningknowhow.com/edible/fruits/blueberries/blueberry-plant-pruning.htm