Flax
Flax can be grown from [Flax Seed]?s. I have encountered two [Flax Seed]? types so far: Old Egypt and Green Nile. You can multiply the [Flax Seed]?s by letting them grow without weeding the flax beds.
If you want to harvest flax from the flax bed, you will have to weed the bed, usually two times through the process. Shortly after the second weeding, the flax will become harvestable.
Old Egypt is the easiest to tend to. It usually yields one flax per bed, but does not need any watering.
Green Nile needs one turn of watering together with the first weeding, but provides two flax per flax bed in return.