john martin wrote:
a short while ago put some Pieris Forest Flame in some pots with some new
john innes no 3 soil.

the growing tip leaves instead of being red have turned a pale yellow.

should i add some proper garden soil or is there something else i should be
doing to get the red colour back?

Could be chlorotic. And check that it's draining well between watering,
don't over-water and also check the pot is big enough for it.
--
Sacha Hubbard
www.hillhousenursery.com
South Devon