We are always asked for some plants of these in early spring. They do not last long in our hot, dry summers. M. alpestris makes a compact little tuft, full of flowers in the spring.
You can sow the seed in August and plant in coldframes, where they will winter all right, but if you have any stock it can be divided quite easily and planted in coldframes in September, a few inches apart.
For years we grew a very useful species of myosotis for cutting in winter. It was planted in fall along the edge of the carnation benches, and as it grew entirely outwards and hung over the sides of the bench it did no harm to the carnations except what strength it took from the soil, and that we could afford. We propagated a few dozen by cuttings in late spring, kept them in 3-inch pots during summer, and after the carnations were planted we put in a plant of myosotis, not too thickly, one about every three feet. From them we picked sprays of their beautiful flowers all winter. I am not positive, but the species was, I feel sure, M. Azorica. M. dissitiflora has large, deep blue flowers, fine for borders, but not so good for cutting as Azorica.