From the ArcaMax Publishing, Gardening Newsletter:
http://www.arcamax.com/news/gardening/s-1890-480399
Question: When should swiss chard be planted? In which colors are
seeds available?
Answer: Swiss Chard is easy to grow. Plant the seeds in the spring and
harvest anytime, from baby leaves for salad to larger leaves for
cooking. Burpee's carries 'Bright Lights', a packet containing several
colors. You can also purchas 'Rhubarb Chard' that has crimson stalks
and glossy green, crinkled leaves, or 'Fordhook Giant' with dark
green, thick, tender leaves. Order online at: http://www.burpee.com or
phone your order toll-free (800) 888-1447.