Pluck not the wayside flower,
It is the traveller's dower;
A thousand passers-by
Its beauties may espy,
May win a touch of blessing
From Nature's mild caressing.
The sad of heart perceives
A violet under leaves
Like sonic fresh-budding hope;
The primrose on the slope
A spot of sunshine dwells,
And cheerful message tells
Of kind renewing power;
The nodding bluebell's dye
Is drawn from happy sky.
Then spare the wayside flower!
It is the traveller's dower.

William Allingham

http://www.poemhunter.com/poem/wayside-flowers-2/