When you are in the limestone area of Yorkshire, the first grass of the year to be noticed is the Blue Moor grass—Sesleria caerulea. This flowers from early March and whole hillsides can be turned blue; it is quite striking in its electric blue colour and anyone not familiar with grasses will wonder what plant it is. I do not know of any records in the Calder Valley as it is strictly a plant of limestone strata.

                                 Blue Moor Grass near Grassington