The weeping pea tree, also known as Siberian pea shrub (Caragana arborescens "Pendula"), grows 10 to 15 feet tall with an equal spread. Its pealike flowers appear in May, giving way to long, seed-filled pods after the blooms fade. This deciduous tree is hardy in U.S. Department of Agriculture zones 2b to 8, where it adapts to both dry and moist soils, acidic or alkaline. The weeping pea tree also thrives in full or partial sun. Besides pruning this plant as you would another weeping specimen, you have the option of thinning the multiple-trunk structure to a single stem at planting.
- Skill level:
- Moderately Easy
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Things you need
- Pruning saw
Look at the tree after planting it. Locate its centre-most trunk. Retain that stem, and remove all others at the soil line with loppers or a pruning saw. This step is optional and solely based on your preferred form for the plant.
Find the bud union on the tree to confirm the plant is grafted, usually the case with weeping pea tree varieties. The union is a bulging area below the crown where the nursery propagated the tree using a rootstock. 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.
Trim branches that reach the ground, if that is your preference. Otherwise, let them drag. Cut into the wood at a 45-degree angle, 1/4 inch from a bud.
Remove crossing, dead, and diseased stems at their point of origin on the tree. You can see what is going on with the branches more easily in the dormant season when the plant has no leaves.
Thin the pea tree's top branches to 2 inches apart. This space allows adequate air circulation within the plant. Prune any twigs that sprout below the crown.
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