To plant your Easter Lilies outside, prepare a well drained garden bed in a sunny location with rich, organic matter. Use a well draining planting mix, or mix 1 part soil, 1 part peat moss, and 1 part perlite. Good drainage is the key for success with lilies. To ensure adequate drainage, raise the garden bed by adding good soil to the top of the bed, thus obtaining a deeper topsoil and a rise to the planting area.
Plant the Easter Lily bulbs 3 inches below the ground level, and mound up an additional 3 inches of topsoil over the bulb. Plant bulbs at least 12 to 18 inches apart in a hole sufficiently deep so that the bulbs can be placed in it with roots spread out and down, as they naturally grow. Spread the roots and work the prepared soil in around the bulbs and the roots, leaving no air pockets. Water immediately and thoroughly after planting.
As the original plants begin to die back, cut the stems back to the soil surface. New growth will soon emerge. The Easter Lilies, which were forced to bloom under controlled greenhouse conditions in March, bloom naturally in summer. You may be rewarded with a second later in the summer also, but most likely you will have to wait until the next June or July to see your Easter Lilies bloom again.
Another planting tip to consider is that lilies like their roots in the shade and their heads in the sun. Mulching helps conserve moisture in between waterings, this keeps the soil cool and loose, and provides a fluffy nutritious medium for the stem and roots. An attractive alternative would be to plant a "living mulch," or a low ground cover of shallow rooted, complementary annuals or perennials such as, Violas or Pimulas.
The Easter Lily bulbs are surprisingly hardy even in cold climates. Just be sure to provide winter protection by mulching the ground with a thick generous layer of straw, pine needles, leaves, ground corncob, pieces of boxes or paper bags. Carefully remove the mulch in the spring to allow new shoots to come up. Your Easter lilies will bring beauty, grace, and fragrance to your garden for years to come.