Talk:Hydration Cell/@comment-5419930-20121008204120/@comment-5574324-20121008204741

I don't believe they're actually required, no. However they do increase growth rate, and nutrition value. Depending on the nutrition value (really no way to check) of the crop, it will allow plants to grow instead of disappear. When a seed bag doesn't want to plant, it's usually because the nutrition value of the crop is too low to support the plant (other times it's just the wrong light level).