As a group,flower bulbs are outstanding plants–colorful, showy, and generally easy to grow for container gardening. Many have evergreen foliage; with others, the leaves ripen after flowering and the bulbs are stored and started again, year after year. Some flower bulbs are hardy, others, tender, though what is, and is not hardy, in a particular area is a matter of winter temperature averages. In cold regions, tender types–tuberous begonias, gloxinias, and calla lilies–can be treated like summer in container gardens. This gives the gardener a wide variety to grow from earliest spring to late fall.
Dutch flower bulbs include crocus, snowdrops, eranthis or winter aconites, chionodoxas, scillas, grape hyacinths, leucojums or snowflakes, Dutch hyacinths, daffodils, and tulips, the pride of northern spring gardens. Though hardy, they are not adapted to garden containers outdoors where temperatures drop much below freezing.
They require the protection of a shed, unheated cellar or cold frame. Gardening Pots can also be dug into a trench in the ground for the winter and covered with a thick blanket of marsh hay or straw. Where temperatures do not go below freezing, Dutch flower bulbs can be left outdoors in gardening pots over the winter.
For best results in a container garden, start with fresh, firm, large-sized flower bulbs each fall. Insure good drainage in the bottom of each garden pot and use a light soil with bone meal added. If in clay pots, plunge during the rooting period in damp peat moss to prevent rapid drying out. If this occurs too often, roots will be injured and flowers will be poor. When weather permits, after the danger of freezing passes, put your container garden outside where they are to flower or in a nursery row until they reach the bud stage. After blooming, move your container garden where foliage can ripen unseen.