Planting in the winter is more limited than in warmer seasons. It’s possible to plant flowers in early winter as long as the ground hasn’t frozen yet, or in late winter when the ground has thawed even though frost may still be in the forecast. After planting, water well and cover with 6 inches of mulch to protect the new plants from freezing winds. If the ground is frozen to a depth of several inches, it’s not feasible to plant, even if the plants are dormant. Even if the ground has thawed, if temperatures don’t reach above freezing, planting flowers in winter is difficult.
Bulbs that Bloom in Winter - Crocus, glory in the snow, star flowers and helleborus are all flowers that bloom in the winter but need to be planted in the fall. Iris unguicularis blooms in white, purple and blue and can be seen peeking through the snow.
Annuals - Annuals are plants that bloom gloriously for one season and then die back. Many annuals are self-seeding and will come back year after year. Several types of annual flowers can be planted in early winter and will reward you with blooms in early spring. These flowers include calendula, cornflower, larkspur, pansy, sweet alyssum and stocks.