The choice of filter will depend upon the colours, and their intensity, in the image. I would certainly want to have light yellow, orange and light green filters. Depending on the colour of the flowers and the foliage, red, a darker green and light blue (especially if there is snow surrounding the plant) may also be useful. A good guide to filters is in Ansel Adams' "The Negative", which is possibly the best guide to black and white photography available.(posted 8976 days ago)