US (CA): Sun Valley grows healing Matricaria
According to them: "These daisy-like and button-shaped flowers hail from the Aster Family, and they are composed mainly of picnics, puppy dogs, and sunshine. Okay, the first two aren't true, but Matricaria is a natural summertime crop, so sunshine does play a big part in bringing these blooms to their cheerful form."
They grow these flowers year-round in hoop houses, which requires a little bit of seasonal tweaking to their methods; while Matricaria likes the sun and heat, too much light will stunt its growth.
Matricaria is a summer-blooming flower, so to provide a sufficient amount of heat in winter, they cover the hoop houses with plastic. The crops in springtime need little to no environmental control because the coastal, Southern California climate matches up perfectly with their natural growing cycle.
However, when they plant Matricaria in the summer, the flowers have "passed" their natural growing cycle, so the hoop houses are covered with shade cloth to mimic the early spring. This is because the long days of summer make the Matricaria want to bloom as soon as possible, but with the use of shade cloth, they are able to get them to stretch to lengths of 24-32 inches.
Read more at the Flower Talk blog