Pimpernel Seeds - Blue (Anagallis Arvensis Caerulea) Known as Blue Pimpernel
Blue is the most sought-after color in the garden and there are few true blue flowering plants available. it has a spreading habit which makes it well-suited for edging a border, as a general ground cover plant, and in pots and hanging baskets.

The Blue Pimpernel plant establishes easily and quickly grows and spreads to produce nice ground cover plants. This unusual little plant is originally from Europe. Known as Blue Pimpernel, 

The Blue Pimpernel flower is open only when the sun shines. The habit of closing in dull weather and when rain is approaching has given the plant the name Poor Man's Weather-Glass. This caerulea variety of Anagallis is not as famous as Scarlet Pimpernel, but you cannot go wrong with adding this blue version to your flower garden. 
How To Grow Blue Pimpernel: Sow Pimpernel seeds in peat pots and gently press the ground cover seed into soil and barely cover. Pimpernel seeds need light to germinate. You can also directly sow Anagallis Arvensis seeds after all danger of frost has passed in groups of 3 - 4 seeds spaced 12 inches apart. Thin to the strongest plant. If consumed, Pimpernel ground cover plants can be toxic to livestock and humans.