Devilstrand is impossible to grow.

[laston]

I'm pretty sure the site of your colony determines the speed of growth.  In the upper locations you get less sunlight power day so less growing.

[Noobshock]

As a quick note to Tynan here, I'm not sure leaving the Devilstrand as a growable option in the hydroponics menu is a good idea, it's basically a noob trap that serves no purpose other than frustrating the player UNLESS of course you're planning to implement some kind of counter-play to solar flares. Devilstrand being a high value material, of course newer players are at some point all going to try growing it in hydroponics, just to find out they got trolled. Something about having a choice that's always the wrong choice...