From Ground: First, water the blue Flax plant to moisten the soil. Then, using a spade, dig a wide circle around the plant at a distance that'll ensure the root ball is not disturbed. Carefully work the spade under the root ball and lift the plant from its original location. Keep as much soil around the roots as possible during transportation to the new site.
From Pot: Water the blue Flax plant to dampen the root ball and then turn the pot upside down, for easy removal. Gently tap the pot's edges to loosen the soil and carefully draw the plant out, retaining as much of the original soil around the roots.
From Seedling Tray: Wait for two pairs of true leaves to form on the blue Flax seedling before transplanting. Gently hold the seedling by its leaves (not the stem) and use a small tool, like a pencil, to push up the soil at the base, lifting the seedling out. Be extremely gentle to avoid damaging the tender roots.