Q.Plants suitable for growing in cremated human ashes
Before her death, my wife requested that the family plant a shrub or bush in a pot using some of her ashes. What plants might be suitable for this and what proportions of compost and ashes would be appropriate? Her favorite flowers were fuchsias. Would any variety of those are well suited?

We are sorry for the loss of your wife.
Plants and trees are a wonderful way to make a memorial to a loved one.
Unfortunately the cremation remains are actually toxic to plant life.
The remains contain large levels of sodium and the ph are two reasons that planting with the ashes is not possible.
https://www.gardeningknowhow.com/ornamental/flowers/roses/memorial-rose-bushes.htm