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The blackened site of the plane crash, overgrown with rhododendron bushes and hidden in the quiet woodlands of eastern England, had for 80 years been the final resting place of a missing American pilot.

It's next to a type of rhododendron seedling that is the only known one in the world.

“In my front yard, I took out some rhododendron and put in Cistus, and they are doing excellently,” he says.

If you are growing acid-loving plants like blueberries, heathers, hollies and rhododendrons, they will not appreciate the addition of wood ash.

In recent years, Joan Baldwin, the president of the organization, said she has seen azaleas and Washington’s native state plant, the rhododendron, turn brown and droop due to longer, hotter and drier summers.