Edit: Currently on 1.9.0 due to mods I wanted, none that change or should be affecting farming itself
So first winter, finally got making a greenhouse and the temperature, while still hitting negatives, was still within the parameters even before Greenhouse bonus for Rye to grow pretty steadily so I planted them. Ensured they was solid base under as well incase that was the issue from last time (like not just 1 tile of floating soil). It has been almost a week and most are still in Stage 1, one is on Stage 3. So is this normal or is the cold possibly slowing down the growth and just not all plants are hit by it?