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Is mulch your biggest plant decision in a Chesapeake suburb
Yes, if it is in the first five feet. Maryland DNR’s Firewise plants list says many commonly used mulches can be quite flammable and pose the threat of ignition by windborne embers. Shredded hardwood bark is High now and High after one year. Decorative ground rubber is Very High. Brick chips are Nonflammable. The landscaping factsheet’s Zone 1 is 3–5 feet and still says fire-resistant plants and mulches. IBHS Essential requires removing wood and rubber mulch from 0–5 feet. The Maryland plant evidence page separately presents 852 USDA occurrence records and 169 DNR plant-list owners. Neither replaces the mulch decision at the wall.
You are in a Anne Arundel foundation bed looking at shredded hardwood and a 852-row plant catalog, asking which oak to plant. Maryland’s opened table is grading the stuff under the oak.
This is not a Maryland doorway.
Why it matters
“Chesapeake suburb” is easy to hear as no wildfire problem. DNR still prints 30 feet, 4 feet from the house, and a mulch ignitability table. Zone 0 in California, Oregon, Firewise, and IBHS is a stricter 0–5-foot noncombustible band. Maryland’s Zone 1 still names mulches. Those are not the same document. This site does not store mulch as a plant taxon. The opened bark-mulch finding is the IBHS/Oregon row.
Counting 852 USDA rows as the decision inflates a catalog that is not a DNR rating and is not the five-foot bed.
How it works
Maryland Zone 1 (landscaping factsheet):
- 3–5 feet from the house.
- Prevent flames from directly touching the house.
- Fire-resistant plants and mulches in this zone.
- Avoid evergreen plants and shrubs in close proximity.
Maryland Top Ten (Firewise Living page):
- Green, mowed lawn at least 30 feet wide.
- Use Firewise plants and mulches. Avoid evergreens and ornamental grasses within 30 feet.
- Keep landscape plants a minimum of 4 feet from the house. Do not plant evergreen shrubs or ornamental grasses against the house.
The mulch table (Firewise plants PDF):
| Material | Initial | After 1 year |
|---|---|---|
| Brick chips | Nonflammable | Nonflammable |
| Marble / limestone chips | Nonflammable | Nonflammable |
| Oyster shells | Nonflammable | Nonflammable |
| Bluegrass sod | Very Low | Very Low |
| Cocoa shells | Very Low | Low |
| Pine bark nuggets (1–2 in) | Low | Moderate |
| Pine bark nuggets (½–1 in) | Low–Moderate | Moderate–High |
| Shredded pine bark | Moderate | High |
| Composted yard waste | Moderate | High |
| Ground recycled pallets | High | High |
| Shredded cypress bark | High | High |
| Shredded hardwood bark | High | High |
| Pine straw (needles) | High | Very High |
| Oat straw | Very High | Low |
| Decorative ground rubber | Very High | Very High |
The scorecard (WUI Home Risk Assessment form):
- Non-flammable or no mulch used near house: 0.
- Flammable mulch used adjacent to house: 4.
IBHS Essential (finding record):
- 0–5 foot noncombustible zone.
- Remove combustible groundcover such as wood and rubber mulch.
- Oregon OSFM: river rock, gravel, or pavers; remove bark mulch.
This directory:
- Maryland: 852 records. 460 on-list, 141 avoid, 44 conflict, 207 candidate. Occurrence, not a mulch rating.
- Juniperus virginiana currently computes as avoid. That is the evergreen DNR tells you not to put against the house.
- This site has no plant taxon named shredded-hardwood-bark. Mulch sits on the bark-mulch finding and on Zone 0.
The paths
| Claim | Opened source | What it is not |
|---|---|---|
| Pick a Firewise oak | 852 USDA rows | The 4-foot mulch band |
| Fire-resistant mulch in Zone 1 | MD 3–5 ft factsheet | IBHS Essential mineral soil |
| Shredded hardwood | High / High after 1 year | A Low mulch |
| Rubber mulch | Very High / Very High | A recycling win in Zone 1 |
| Brick / marble / oyster | Nonflammable | A plant list |
| 4 feet from the house | Top Ten foundation rule | Zone 0 |
| 30-foot mowed lawn | Top Ten | A species table |
What people mix up
- 852 Maryland plant records with the decision at the foundation.
- Maryland’s 3–5-foot “plants and mulches” Zone 1 with IBHS Essential’s 0–5-foot no wood mulch.
- Shredded hardwood as the default Chesapeake bed with DNR’s High rating.
- Rubber mulch as nonflammable because it is not wood. DNR: Very High.
- Pine straw as a native look with High / Very High.
- Cocoa shells as a free pass after a year. DNR: Very Low becomes Low.
- Evergreen foundation shrubs with the 4-foot rule.
- Fence as a wick with mulch as a wick. Related, different object.
How to check
- Open Firewise Landscaping Plants for Maryland. Read the mulch table. If the live host 403s, the quotes on this page are from the retrieved document.
- Open the zone factsheet. Read Zone 1 = 3–5 feet.
- Open Firewise Living in Maryland. Read 4 feet from the house.
- Open the home risk form. Read the mulch scoring lines.
- Open Zone 0 and the bark-mulch finding.
- Open Maryland plant evidence. Distribution is not a recommendation.
- Do not treat shredded hardwood in the first five feet as a Firewise plant.
Limits
This page quotes retrieved Maryland DNR Forest Service document text (plants PDF mulch table, landscaping factsheet zones, Firewise Living top ten, home-risk mulch scores) and the opened IBHS Essential standard via the bark-mulch finding. Live dnr.maryland.gov PDFs and HTML returned HTTP 403 to curl from this worktree; they are not treated as unread. The March 2018 Firewise Landscaping woodlands brochure and the 2025 UMD Living Landscapes metric (leave-the-leaves / organic mulch) were not opened as primary files. 852 is a count of stored USDA-distribution rows as of this writing, not a DNR statistic. Zone 0 is not a planting list.
Related records
- Maryland plant evidence
- Bark and wood mulch in the first five feet fail IBHS Essential Zone 0
- Zone 0 in California, Oregon, Firewise, and IBHS
- Juniperus virginiana
- Fence as a wick
- Glossary: Zone 0
- Glossary: Firewise USA
Questions
Is mulch your biggest plant decision in a Chesapeake suburb?
Often yes, because it sits in the first five feet. Maryland DNR’s Firewise plants list: many commonly used mulches can be quite flammable and pose the threat of ignition by windborne embers. With the proximity that mulch usually has to the home, the risk becomes even more significant. Shredded hardwood bark is rated High initially and High after one year. Decorative ground rubber is Very High. Brick chips, marble/limestone chips, and oyster shells are Nonflammable. This site’s Maryland plant evidence page currently holds 852 USDA-distribution records. Those rows are not the mulch bed against the foundation.
Does Maryland still allow plants in the first few feet?
The opened landscaping factsheet’s Zone 1 extends 3–5 feet from the house. Goal: prevent flames from directly touching the house. Fire-resistant plants and mulches should be used in this zone. Evergreen plants and shrubs should be avoided in close proximity to the house. The Firewise Living top-ten list: keep landscape plants a minimum of 4 feet from the house; do not plant evergreen shrubs or ornamental grasses against the house. That 4-foot/3–5-foot band is not IBHS Essential’s 0–5-foot noncombustible zone.
How does that differ from IBHS Essential Zone 0?
IBHS Wildfire Prepared Home requires a 0–5 foot noncombustible zone and removal of combustible groundcover including wood and rubber mulch. Oregon OSFM guidance separately tells homeowners to use river rock, gravel, or pavers and to remove bark mulch in the five-foot buffer. Maryland’s opened table still grades some organic mulches Low or Moderate. Those documents are not the same. See Zone 0 in California, Oregon, Firewise, and IBHS.
Does Maryland score mulch on a home risk form?
The opened Maryland WUI Home Risk Assessment form stores non-flammable or no mulch used near house as 0 points, and flammable mulch used adjacent to house as 4 points.
Is this a Maryland doorway page?
No. The object is mulch ignitability in the 3–5 foot band. The state surface composes three sourced layers: 852 USDA occurrence records, 169 Maryland DNR plant-list owners, and this guide’s non-plant mulch and zone guidance.