Also called moneywort and golden globes, creeping Jenny (Lysimachia nummularia and L. congestiflora) grows only 4 to 8 inches tall and has long, leafy stems that spread 1 to 3 feet. The 1-inch round leaves occur in opposite pairs on thin stems that root in moist soil. If given ample sunlight, bright yellow, fragrant blossoms appear at the base of leaf pairs. Lysimachia congestiflora is a better candidate for indoor cultivation.
Lysimachia nummularia may be grown as a short-term houseplant. Because this species' stems grow very long and vigorously, it's best planted in a hanging basket. However, it needs a cool winter dormancy to remain robust and healthy. It may falter after 12 to 24 months of continuous growth indoors, because indoor temperatures are too warm in winter. Placing this European-native in an unheated room over the winter can prolong its life indoors. Cultivar selections of this species include Aurea and Goldilocks, which display more yellow-green foliage, compared with the typical green.
Native to milder winter regions of China, Lysimachia congestiflora is a better choice for indoor cultivation, because conditions mimic a subtropical climate. This species' stems are stiffer and branch more, creating a mat-like plant rather than a large, sprawling or weeping specimen, compared with L. nummularia, which needs lots of trimming. Cultivars of this species include Outback Sunset, Persian Chocolate, Lyssi and Walkabout Sunset.
Plant creeping Jenny in containers filled with a soilless potting mix, such as a peat-based houseplant medium. Do not use topsoil, as it contains pathogens, microorganisms and various critters such as ants and worms. Moreover, topsoil compacts and hardens after a couple of cycles of watering and drying. The container must have a bottom drainage hole, otherwise root rot is likely. Keep soil evenly moist, but never soggy or bone-dry. During the winter, when temperatures are cooler, and days shorter, the soil may become slightly drier between waterings. Fertilize lightly from spring to fall. Do not fertilize and encourage growth during winter months.
Although both species of creeping Jenny tolerate full sun, it's difficult to supply all-day sun indoors. Instead, place either plant near an eastern or southern window to receive a couple of hours of direct sunlight. Sun rays promote production of flowers in late spring or early summer. Very bright indirect light will sustain a nice foliage display, but a northern window is too dim.