Which preposition to use with rhododendron

in Occurrences 3%

A young copper beech, freed from its rankly increasing enemies of branching laurel and encroaching bramble, now spread its glory of transparent ruddy leaf in the sunshine above trim hedges, here and there diversified by the pale gold of a laburnum, or the violet clusters of a rhododendron in full flower.

along Occurrences 1%

Waited, too, the Army of the Callahan at the mouth of the Gap, and waited restlessly Captain Wells at the door of his tent, and Flitter Bill on the stoop of his storewaited everybody but Tallow Dick, who, in the general confusion, was slipping through the rhododendrons along the bank of Roaring Fork, until he could climb the mountain-side and slip through the Gap high over the army's head.

at Occurrences 1%

And yet but a week ago, rhododendrons at New Athos, wild roses and mallow in full bloom at Gudaout, acres of saffron hollyhocks, and evening primroses at Sotchi!

on Occurrences 1%

"That bank is always a beautiful sight; but wait until you have seen the rhododendrons on the long portage.

Which preposition to use with  rhododendron