Q.illex “Heller” bushes
We have planted llex “Heller” bushes and each over a year or 2 dies. We have a soil test which shows no problems. Do you have a suggestion for a similar shrub? The soil is well drained, but in constant sun.

These links will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/holly/japanese-holly-care.htm
https://www.gardeningknowhow.com/ornamental/shrubs/barberry/barberry-shrub-care-tips.htm
https://www.gardeningknowhow.com/ornamental/shrubs/weigela/growing-weigela.htm