A bulb ring suppresses turfgrass competition at the base of a woody perennial shrub or vine.
A good hunch A person has checked it against its sources. If you skip this, it still grows, just less well. The planner suggests it.
How it works
Resource competition and physical occupancy of the root collar zone.
The evidence
Evidence: checked against 3 sources in the research-based literature.
The 3 sources
… it is generally advisable to maintain an 18- to 24-inch weed-free strip in the intrarow for the first two or three years of vine growth.
Mulch generously to keep the roots cool and moist, build soil organic matter, and discourage weeds (Figure 4).
Mulch generously to keep the roots cool and moist, build soil organic matter, and discourage weeds.
Plant teams that rest on it
How this rule has changed
Every change is dated, newest first. The full record, with each reason, is in the data download.
- Sources updated
- Details updated
- A person read the sources and confirmed it
- Details updated
- Details updated
- Added to the rules
Cite this page
Milpa Gardens. "A bulb ring suppresses turfgrass competition at the base of a woody perennial shrub or vine." Evidence grade: A good hunch. https://milpa.garden/rules/bulb-ring-suppresses-turfgrass-competition-base-woody/
A garden planner built on graded evidence. Every claim states its evidence grade and links its sources on the page. Cite it with the grade, and add the date you read it.
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How we grade evidence
- Well established
- The rule names its mechanism and is settled, by sources a person has read and checked or by plain arithmetic and geometry.
- Promising
- The mechanism is named and the literature backs it. A few questions are still open.
- A good hunch
- Plausible by its mechanism, but field studies are thin, so treat it as a lean.
- Contested
- The evidence points both ways, or no study has tested it, so the planner does not enforce it.
- Refuted
- The claim did not survive its sources. It is kept so the folklore can be answered.