Forsythias can be susceptible to disease and infection if they are pruned with dull or rusty loppers. When pruning, make sure you start with high quality tools that are sharp and clean. You’ll need a pair of pruning shears for small branches and a pruning saw for larger ones.
Choosing the right pruning shears will greatly reduce the amount of effort needed to complete this task. For smaller branches and twigs, we recommend handheld shears that are made from a high-strength steel or carbon blade.
If you are removing larger branches and limbs, you’ll want to invest in a pair of loppers. Loppers are essentially larger shears that are equipped to get through much larger branches. I personally recommend purchasing pair of loppers that have extendable handles to reach taller branches.