It was very dark indeed in the wood, for the lightning was now becoming infrequent, and the hail, which was pouring down in a torrent, fell in columns through the gaps in the heavy foliage.
The woods across the line were but the scarred and blackened ruins of woods; for the most part the trees had fallen, but a certain proportion still stood, dismal grey stems, with dark brown foliage instead of green.
There are no more uses of "foliage" in the book.
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It’s difficult to spot the birds in the foliage.
I like to rest my eyes by periodically looking up from the computer and gazing out the window at the foliage.