This is a great fall energy question. So asked the people at Scotts for their answer.
A recent study done at the Michigan State University shows that you can forget about raking, blowing, and bagging leaves. Instead, just mulch them with your lawn mower and feed your lawn.
When you rake your leaves, it costs you. Your local taxes pay for trucks to sweep up your leaves or pick up your leaf bags, which often end up in landfills. If you burn leaves, you are just sending up clouds of carbon into the atmosphere. Mulching leaves simply recycles a natural resource, giving you richer soil for free.
Mulching will save you work, improve your soil, and add nutrients.
Take the grass catcher off your mower and mow over the leaves on your lawn. You want to reduce your leaf clutter to dime-size pieces. You’ll know you’re done when about half an inch of grass can be seen through the mulched leaf layer. Once the leaf bits settle in, microbes and worms get to work recycling them. Any kind of rotary-action mower will do the job, and any kind of leaves can be chopped up. With several passes of your mower, you can mulch up to 18 inches of leaf clutter.
When spring arrives, you will notice something. The leaf litter you mulched up in the fall will have disappeared. Your rake will look dusty and neglected. Your grass will look greener than ever.
These ideas were shared from Scotts.