One question that frequently arises during our planting and spring cleanup sessions is, "Are you going to put down Weed Block before you mulch?" It's a query that often leads to a discussion about the misconceptions surrounding this commonly used, yet often misunderstood, landscaping product.
The Weed Block Dilemma
Clients are typically puzzled when our answer is a resounding 'no.' The confusion stems from the expectation that using weed block – sometimes mistakenly referred to as landscape fabric – should equate to less weeding throughout the year. Allow me to shed light on why I choose not to employ weed block in my landscaping endeavors.
Weeds Persist Despite Weed Block
Contrary to the belief that weed block entirely prevents weed growth, persistent weeds often find a way to grow through or on top of the fabric. Seeds germinate near the top of the mulch, whether there is weed block beneath or not. These seeds send roots downward, where they either grow on top of the fabric or find a way through.
Challenges with Mulch and Weed Block
As mulch breaks down over time, it leaves a nutrient-rich layer on top of the weed block, providing an ideal environment for weed growth. The frequent raking of mulch, coupled with natural disturbances from animals, results in unsightly pieces of weed block protruding through the mulch.
Hindrance to Future Landscape Work
While gardeners and landscape enthusiasts may initially find weed block appealing, its drawbacks become apparent when they seek to make changes in their gardens. Transplanting, adding new plants, or altering the landscape becomes a cumbersome task as the fabric hampers these activities. Plant removal becomes a challenge, with roots intertwined in the fabric and holes needing to be cut for new plant additions.
The True Purpose of Landscape Fabric
Landscape fabric, often incorrectly labeled as weed block, serves a different purpose. Its primary role is to prevent fine particles from infiltrating open aggregates. This is particularly useful in scenarios like retaining wall backfills, beneath patios and driveways, and occasionally in rain gardens or dry river beds.
The Role of Landscape Fabric with Aggregates
Landscape fabric reinforces base aggregates, preventing migration and enhancing strength. It's instrumental in situations where maintaining clean aggregates is crucial, such as under pavers or in retaining walls.
Drawbacks in Rain Gardens and River Beds
While landscape fabric effectively prevents stone migration, its use in rain gardens or dry river beds may hinder the natural process of sediment settling. Regular maintenance and refurbishment may be impeded by the fabric in certain situations. Fabric is used on a case by base basis for these applications
Alternatives for Weed Control in Landscape Beds
At Selander Landscape, we advocate for two practices that minimize the need for weeding:
1. Proper Mulching
Applying approximately two inches of shredded hardwood mulch in planting beds provides an effective barrier against weed growth. (A future blog post will delve into the intricacies of mulching.)
2. Pre-emergent Herbicide
Products like Preen for homeowners target the radicle, preventing germinated seeds from growing into weeds. This herbicide doesn't impact established plants but works as a preventative measure for any seeds landing on fresh mulch.
Concluding Thoughts
In essence, weed block falls short of its promises, and landscape fabric serves a distinct purpose. The combination of mulching and pre-emergent herbicides offers a more effective strategy for weed control in landscape beds. While complete elimination of weeds may be unrealistic, these practices, coupled with regular 'detail visits,' ensure a landscape that remains pristine throughout the year.
Thank you for your time,
Mike Selander
Owner
Selander Landscape
Comments