Posted: 12/04/2016 at 19:29
BRISTOL, 3 litre pot size is ideal I think......much bigger, as Jinxy said, and they do not settle as well.
I would plant out your chosen 3 litre plants.....you will find they will grow fairly quickly during the summer...and infill with annuals that wont overwhelm those shrubs.
However, my local nursery has 10 litre plants for around £15. I planted prostrantheras, camelias and phormiums last week in this size. Nothing rootbound. Height average 4' to 5' . Not for my garden but I have every confidence they will do well
shrubs like the paniculata hydrangeas will grow quickly and make as much as 5' this summer from 3 litre pots.