I've tried 3 times this year to get some going , though the "organic" ones i have bought both red and white cross state lines, Every "food" in Australia gets radiation treatment and sterilizes the seeds...Once immersed in water they swell up and split then die , 100% non viable... Also with a lot of the literature i have seen all recommend not to consume too much of the leafy greens (for humans) because of a chemical produced that can reduce assimilation of some vitamins/minerals ... At the moment I have Amaranth growing that doesn't have the same problem and can eat the greens to your hearts content, My understanding of both Quinoa and Amaranth is that the seed heads are harvested by shaking the seeds out of the plant over several times during harvest rather than removing the seed heads completely as the seeds don't all ripen at the same time... Another problem with Quinoa is temperature, anything over 32 deg C (89.6 deg F) will sterilize the pollen vastly reducing yields .....
For anyone who hasn't come across Quinoa (Keen-wah) It is a rice substitute many many times better for you , i have 2 young children (5 and 2 year old) and i think they have had rice twice in their lives , All home-cooked "rice dishes" are Quinoa in my household , included are the "rice custard" desserts, it does look different on the plate but would be hard pressed to pick a flavor difference , My kids have it by choice and it cooks in 1/2 the time of rice but does require more prep due to the saponins that require removal by washing
Both of these pseudo-grains have too many good points to list and would encourage everyone to self study further into these foods that cant be dismissed
Quina
Amaranth