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Saw 2-3 secondary stems to the ground on mature plants. Cut off the tops of the seed pod branches. Cut away dead or diseased branches. Prune off wispy branches. Cut off branches that are rubbing against the main stem. Prune 1/3 of the plant over several seasons to "restart" your plant.
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. 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. Seed pods are left over after the flowers bloom and fall off the plant. They look like buds on the tips of the weigela branches. Use a pair of hand shears to cut the upper growth right above a lower hanging bud on the branch.  Do not cut more than 1/2 of the branches full length. Make the cut straight, right above a flowering bud. Cutting away old buds will promote the growth of new, stronger buds which will lead to more robust blooms the next year. Look for light grey or brown branches that feel brittle or hollow to the touch. Diseased branches may also have spots or mold on them. Cut these branches down to the main stem, on a 45-degree angle, to make room for new growth and prevent potential disease from spreading. If the center of the branch is brown or gray, the branch is dead. If a branch looks weak or wispy, there's a good chance it will never develop flowering buds. Cut away these branches down to the main stem to promote growth in other parts of the plant. Leave strong branches that have minimal offshoots and that are capable of growing flowers. You should cut branches that are rubbing up against the main stem or crossing over, as they can damage the plant. Use a pair of hand shears and cut the branches down to the main stem. Use rejuvenation pruning if you want to start over with your weigela shrub. Prune all the branches down to 1/3 each season until the shrub is 4–10 inches (10–25 cm) in height and there is only new branches left. This is a great way to restart your plant without having to purchase a new one. You should rejuvenate prune in the late winter.