Greenstem Forsythia requires consistent moisture during its establishment phase, typically the first year after planting.

Once established, it is relatively drought-tolerant but benefits from deep watering during prolonged dry spells, especially in summer. Avoid overwatering, as this can lead to root rot.

Check soil moisture before watering; the top few centimeters should feel dry.

Prune Greenstem Forsythia right after its vibrant spring blooms fade, typically in late spring. This timing is crucial to ensure next year's flowers, as they form on old wood.

Focus on removing about one-third of the oldest, thickest stems at ground level to rejuvenate the plant.

Also, thin out any crowded branches and eliminate dead, damaged, or crossing wood to maintain an open, healthy structure.

Greenstem Forsythia is readily propagated through several methods. Softwood cuttings, taken in late spring or early summer, root easily in a moist medium.

Hardwood cuttings can also be taken during the dormant season in late autumn or winter.

Additionally, simple layering is effective: a low-hanging branch can be bent to the ground, covered with soil, and allowed to root while still connected to the parent plant, offering a reliable way to create new shrubs.

Repotting is generally not a concern for Forsythia viridissima, as it is primarily cultivated as a large outdoor landscape shrub. However, if temporarily grown in a container, it will require repotting.

Transfer it to a larger container with fresh, well-draining potting mix every two to three years, or when roots become visibly crowded. Always ensure the new pot has sufficient drainage holes to prevent waterlogging.