Never remove more than one-third a plant.

Prune any branches that begin to develop upright on a grafted weeping specimen. The standard rootstock used produces those twigs. They never droop downward. Remove them at the point where they originate. On naturally weeping plants, erect stems arch after they gain some height. 1. Water the Siberian peashrub heavily the day before pruning it.

Run a garden hose at the base of the trunk until the soil feels wet at a depth of 3 inches. Let the water soak in overnight to. Apr 05, It thrives in full sun to partial shade. Despite the shrub’s shape, it actually requires very little training or pruning (beyond the initial grafting).

The stems should naturally start curving down, and they will grow more or less straight toward the ground. They tend to stop about halfway to the bushhaul.barted Reading Time: 2 mins.

Make 6-inch or 8-inch cuts around the shrub with a pair of hedge pruning shears. Focus on snipping growth from the top and sides of the shrub to encourage new growth and shape as desired.