Recently my Windmill Palm started showing new growth after a cold winter. The new frawns immerged showing green among all the dead frawns. Noticing the new growth I cut off the old dead frawns but have noticed the new growth and spear has stopped immerging. It's still green but hasn't grown any further out for the last 3 weeks. The spear is still in there nice and tight. Is this anything to be concerned about? Is it likely to start growing at a normal rate in the near future? Temperatures have been in the low 50's during the day and mid 30's at night.