How to Keep Mulch From Floating Out of Flower Beds

By: Julie Day
Raking scattered pine bark mulch back into flower beds.

Raking scattered pine bark mulch back into flower beds.

During heavy storms and strong winds, some types of mulch have a hard time staying put. When we bought our house, it came with fresh pine bark mulch, and after the first storm I found mulch scattered 25 feet out into the yard!

When that happens, mowing becomes difficult and dangerous, your sidewalks and driveways look messy, and your planting beds soon sprout weeds.

After putting all that work into spreading mulch in your garden, the last thing you want to do is spend time raking it back in after every rainstorm! Here are some tips for keeping mulch in your planting beds where it belongs.

Pine bark nuggets on sidewalk.

Bark nuggets are notorious for floating across sidewalks.

Choose the Right Mulch

All mulches will float and wash away in a flood, but some are more likely to stray than others. Here are the common types of mulch and their floatability factor:

Garden fork in pine straw mulch.

Pine straw mulch.

  • Chips and Nuggets: Wood chips and bark nuggets are infamous for floating away in heavy rain. If you go this route, get larger nuggets that will be heavier.
  • Shredded Bark or Wood: Shredded mulch is a good choice because the pieces tangle and hold each other down. Look for medium or coarse ground mulch with a mixture of large and soft pieces. Hardwood mulches are heavier – and stay in place – better than softwood (pine) mulch.
  • Pine Straw: Pine straw is my favorite choice because the needles entwine and help it stay put. For this reason pine straw is often used on slopes.
Shredded hardwood mulch.

Shredded hardwood mulch tends to cling together.

Remove Landscape Fabric and Plastic Sheeting

If your garden is on a slope or has a tendency to wash out, avoid putting landscape fabric or plastic sheeting underneath your mulch. These create a nice slick surface for the mulch to slide right out of the bed. Instead, to keep weeds at bay, apply multiple thin layers of mulch, watering each layer to help pack it down.

Pine straw mulch behind block retaining wall.

Block retaining walls can help hold mulch in place.

Edging the Beds

The only way to keep mulch completely in the flower bed or garden is to edge it with something high enough to hold in the mulch in place during a storm. Some ideas include:

  • Landscape Edging: Wood, metal, plastic, or stone edging can help keep mulch in its place. Make sure the edging is several inches high.
  • Stones bordering pine straw mulch planting bed.

    Stones bordering planting bed.

  • Plants: Edging plants make a great border to hold in mulch. Monkey Grass (Liriope sp.), Hostas, and ground covers are great choices if planted closely together along the edge of the bed.
  • Pine Straw Edging: Gardeners who love their bark or chip mulch may have success by edging the beds with a foot-wide row of pine straw to catch floating nuggets.
  • Trenching: A small trench (3-4” deep) around the edge of the flower bed can catch washed-out mulch before it gets into your grass. It’s easy to then rake it from the trench back into the bed.
  • Edging with Mulch: You can also try piling your mulch deeper around the edges of the bed to form a low barrier that may keep it from washing as much.
Wood border around flower bed.

Wood border around flower bed.

Help for Slopes

On steep slopes, you’re going to need to take additional measures if you want mulch to stay where you put it.

Ideally, steep slopes should be terraced to create smaller, flatter areas that will hold soil and mulch in place. Terraces help create more garden space, too.

Another option is to cover the mulch with bird netting, then use landscape fabric staples to hold the netting in place and keep the mulch from sliding downhill.

Further Information

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3 Comments on “How to Keep Mulch From Floating Out of Flower Beds”

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  • sandy knapp Says:
    August 15th, 2016 at 9:09 am

    How can I keep pop up valve at end of French drain from floating away and down the street?



  • Bob Connors Says:
    April 18th, 2016 at 4:56 pm

    Not much help here. I have already put in a plastic edging structure to keep the mulch in my garden. The flow of water during the huge storm just over flows the blockade. Does anyone know a way to stake down the mulch ?



  • Alicia Lawrence Says:
    March 27th, 2015 at 2:14 pm

    Great article, Julie! I use Mulch to stop weeds from growing, but I still often have this problem of it floating away. I’ll definitely try your pine straw trick this spring!
    Thanks!!


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