In colder climates you need to store the mums in a dark cool place over the winter months. They need to go dormant. About once a month give them some water to keep the soil moist. In the spring plant them outside and you should see new growth starting. Your mums should have started to grow by now. You can dig them up and see if there is any growth showing from the roots. If not you need to replace them with new mums.
Hi Debbie,
In colder climates you need to store the mums in a dark cool place over the winter months. They need to go dormant. About once a month give them some water to keep the soil moist. In the spring plant them outside and you should see new growth starting. Your mums should have started to grow by now. You can dig them up and see if there is any growth showing from the roots. If not you need to replace them with new mums.