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How to prune weigela
Saw 2-3 secondary stems to the ground on mature plants.
Cutting secondary stems will give you a fuller weigela plant. Locate 2-3 branches that are growing next to the main stem and use a hand-held pruning saw to cut the stems upward at a 45-degree angle.

Options:
[I] Choose 2-3 secondary stems just the same size as the main stem. If you are cutting a tree for a specific purpose, you can cut the branches upward to develop thinner branches..
[II] Cutting the lower part of the branches will allow the plant to be pruned properly. For older plants that are already established, the main stem shouldn't be cut below 45 degrees..
[III] Remove any any shoots that are about 3-4 inches in diameter by trimming them up at a 45-degree angle. Purchase a cutting blade from a hardware store or home improvement store..
[IV] Saw the stems as close to the ground as you can. This will divert the plant's energy to the main stem and new growth, which will promote stronger blooms..
[IV]