Pieris problems

in Plants
I have 2 pieris plants inherited in the garden and in 10 years they haven’t grown. One is knee high and does flower all over but doesn’t get the red leaves and doesn’t grow. The other is a bit taller but has become very woody and sparse and not really flowering. It did get part hidden. What am I doing wrong? Should I dig it out and replant it somewhere else? It’s hanging on there but not doing much.
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It may be your soil doesn't quite suit them and they are unable to get certain nutrients they require. Sequestered iron with magnesium and manganese should correct that.
A good mulch would also e appreciated
e.g.
https://smile.amazon.co.uk/gp/product/B00M48LGKO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
If you have a pic we may be able to give more specific advice
Wisdom is not putting it in a fruit salad.
well I’ve taken some pics. This is the little one that hasn’t grown in 10 years but did flower. See the bluebell for size comparison.
And this is the less healthy one, maybe bad pruning, too old or was half covered by the storage.
Looks a bit sad.
Wisdom is not putting it in a fruit salad.