Water regularly to establish, especially during dry periods. Once established, Shrubby St. Johnswort is quite drought tolerant. Aim for consistently moist, but not waterlogged, soil during the first year.

Reduce watering frequency as the plant matures, allowing the soil to dry slightly between waterings.

Prune in late winter or early spring before new growth begins. This removes dead, damaged, or crossing branches and shapes the plant.

Light pruning can be done after flowering to deadhead and encourage a more compact form. Avoid heavy pruning unless necessary for rejuvenation.

Easily propagated from stem cuttings taken in late spring or early summer. Dip cuttings in rooting hormone and plant in a well-draining potting mix. Keep moist and provide bottom heat for best results.

It can also be propagated by seed sown in autumn or spring.

Shrubby St. Johnswort generally does not require frequent repotting as it prefers to be slightly root-bound.

If repotting is necessary, typically for container-grown plants, do so in early spring before new growth begins. Use a well-draining potting mix and a pot only slightly larger than the current one.