Leaving clippings on the grass can act as a replacement fertilizer, unless you are leaving too many clippings. To avoid this, you should follow our recommended grass maintenance guide which advises to position your cutting deck so it removes only the top one third of your grass blades. So, you should only mulch when you are trimming the lawns.
If you aren’t able to mow regularly and the grass becomes longer than 7 cm in height, then it’s a better idea to bag the clippings and dispose of them. This will mean your freshly cut grass isn’t smothered, or worse, being trapped in by a layer of diseased grass that could impact on the new growth beneath.
We hope this clears things up and helps you to decide on the right way to manage your clippings. You can also check our article Buying a lawn mower? Things to consider before you purchase article.