Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to prune shrubs [title] Thin off any old or dead stems. [step] Shrubs that are old or overgrown may need to be pruned over several years. This is called renewal or renovation pruning.

Ending1: This is why many gardeners remove very young shrubs to reshape them as they mature. Once you've pruned off a few hundred old stems, you can simply replace them with new ones. Ending2: Start by using hand shears and lopping shears to remove any old stems on the shrub. Cut them off at a 45 degree angle. Ending3: In order to cut back old or diseased shrubs, you will need to trim off any oldest ones that are still growing tall and extending past the ground. [substeps] Before pruning, use a garden knife to cut away any shoots near the ground. Ending4: If you have a plant that has lost great growth, pruning it away may make the process easier on it. [title] Trim your shrubs down to the ground.

Answer format: ending1/ending2/ending3/ending4