All types of daylilies grow well in northern climates. However, dormant and semi-evergreen varieties will perform best. Some evergreen varieties may need mulch added for the winter.
Daylilies do best in full sun but will tolerate some shade. They do best if they receive 6 or more hours of sun daily. Daylilies don't like to be planted around trees. Trees have shallow roots and cause daylilies to compete for water and nutrients. Pine trees are the exception. In Southern States daylilies are sometimes planted under pine trees to give them dappled shade during the heat of the day.
Daylilies are very hardy and will grow in almost any soil. You don’t need a green thumb to grow beautiful plants. Daylilies require very little care once established and are virtually disease and pest free.
If your soil has a heavy clay base, you can add compost or peat to loosen it. If you have a very sandy soil, you can add organic matter or compost to help store nutrients and water. I use composted cow manure for improving soils.
Soak plants, covering the roots in a pail of water for at least a few hours. If possible soak over night.
Dig a hole larger than the roots and deep enough so the roots can be spread out. Loose soil allows the roots to get an easier footing. Make a small mound in the hole and spread the roots out over it. Bury the plant one inch below the band of white where the roots and green leaves connect. Fill the hole with loosened soil, taking care to cover all the roots. Tamp the soil down firmly to remove any air pockets around the roots. Water well. Water every couple of days for the first week or two, especially during times of drought. This will ensure your plant gets off to a good start.
You can fertilize daylilies if you wish, but don’t over do it. Any standard garden fertilizer will work just fine. I very seldom need to fertilize my daylilies.