In 1.5 weeks the flax (Linum usitatissimum) seeds have sprouted and are about 3-5 cm long. They grew very easily and only needed some sunshine and a bit of water. I divided the sprouts over a couple of pots to give them more space and noticed that the root system was well developed.
Flax seeds have sprouted
Tom van den Bogert
@DrKnittyGritty