Wood vs. rock

Linn County Master Gardener, Claire Smith, offers the following on mulch choices:

      While you’re contemplating donning your thinking cap to plan another flower garden, here’s an interesting comparison by Linn County Master Gardener, Deb Walser  recommending mulch over rock.

     Display beds are often mulched with mulch fabric then covered with rocks.  It is believed this is maintenance-free.  However, after a few years, leaves, dirt and other debris will land in the rocks causing a buildup of organic material.  Weed seeds may then blow in and start to grow in this fertile soil bed.   Often the solution to this problem is adding more rock—which only compounds the problem.  Also, this is not a suitable planting medium for annual flowers.  Rocks must be pushed back and holes cut into the fabric for plant placement.

      Both mulches help hold moisture in the soil during an average spring.  However, in the summer, with higher temperatures, rock pulls valuable moisture, needed by the plants, away from the soil.  Rock does not improve the soil in any way.

      I recommend the use of wood mulch for all beds and borders.  It holds back weeds, holds in moisture and as it biodegrades, helps improve poor soil (i.e. clay).  When soil, leaves and debris land in a wood mulch bed, it becomes part of the soil.  The only disadvantage to wood mulch may be that top dressing, (applying a thin topcoat) may be necessary each spring to maintain the aesthetic appeal, and to fill in any areas where it may have moved or decomposed.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: