Landscaping Rules in Gaithersburg, MD: What Residents Actually Need to Know

If you live in Gaithersburg or are thinking about moving there, landscaping rules are one of those things you probably won't think about until they affect you directly. Gaithersburg has 8 specific rules on the books covering different aspects of landscaping rules, and some of them might surprise you.

Native Plants

Gaithersburg and Montgomery County actively promote native plant landscaping as a core strategy for Chesapeake Bay watershed restoration, stormwater management, and pollinator habitat support. The county RainScapes Rebate Program offers financial incentives of up to $2,500 per residential property for conservation landscaping projects that incorporate native species, which reduce stormwater runoff, filter pollutants, and support native bees, butterflies, and birds. Maryland law (Environment Article 9-1701) protects homeowners' rights to install native plant and pollinator-friendly gardens, preventing HOAs from imposing outright bans on native landscaping even when community covenants otherwise regulate yard appearance. The Montgomery County Pesticide Law (Bill 52-14) indirectly supports native plant ecosystems by restricting the use of cosmetic pesticides on residential lawns, reducing chemical exposure to pollinators and other beneficial insects. The county Department of Environmental Protection maintains a recommended native plant list specifically curated for the Piedmont region where Gaithersburg is located, and several city parks feature native plant demonstration gardens showcasing appropriate species.

Key details: County Program: RainScapes rebates up to $2,500. HOA Protection: MD Environment Article 9-1701. Pesticide Law: Bill 52-14 protects pollinators. Region: Piedmont native plant list available.

There are no penalties for planting native species. HOAs cannot completely prohibit native plant landscaping under Maryland Environment Article 9-1701. Violations of the Pesticide Law (using banned herbicides that damage native plant areas) are enforced by the county DEP.

Gaithersburg is more permissive than most cities when it comes to native plants. That said, there are still limits.

Grass Height Limits

Grass and weeds exceeding 12 inches in height violate Montgomery County housing code standards (Chapter 26, Section 26-9) enforced within Gaithersburg city limits. The county Department of Housing and Community Affairs (DHCA) handles complaints for rental properties, while Gaithersburg's own Neighborhood Services division enforces on owner-occupied and commercial properties. When a violation is identified through complaint or proactive inspection, the property owner receives a written notice to correct the condition within 7 to 14 days. Failure to mow within the compliance window results in the city or county hiring a contractor to cut the vegetation and billing the full cost to the property owner. If the bill remains unpaid, the cost becomes a lien against the property and can be collected through the tax sale process. Vacant lots receive particular scrutiny during the April through October growing season, when code enforcement officers conduct regular sweeps of known problem properties. HOA communities throughout Gaithersburg may impose stricter grass height requirements than the 12-inch county standard.

Key details: Max Height: 12 inches. Code: Montgomery County Code Chapter 26, Sec. 26-9. Enforcement: DHCA (rentals) / City Neighborhood Services (owner-occupied). Remedy: City mows and bills owner; unpaid becomes lien. Season: April-October primary enforcement.

First notice: 7 to 14 day compliance period. City or county mows at owner's expense if not corrected, typically $150 to $400 per abatement depending on lot size. Abatement cost becomes a lien on the property if unpaid. Repeat violations within the same season may result in shorter compliance windows and additional administrative penalties.

Tree Removal & Heritage Trees

Gaithersburg enforces the Montgomery County Forest Conservation Law (Chapter 22A), the Roadside Tree Law (Chapter 49), and the Tree Canopy Law (Chapter 55), creating one of the strongest tree protection frameworks in the Washington DC metropolitan area. Permits are required for removing roadside trees or any trees on properties subject to active forest conservation plans. Development projects must meet specific tree canopy coverage targets, and the county has established a long-term goal of achieving 70 percent tree canopy coverage countywide. The Forest Conservation Law applies to all development activity on lots of 40,000 square feet (roughly one acre) or larger and requires submission and approval of a forest conservation plan before any clearing or grading begins. The Tree Canopy Law (Chapter 55) requires new subdivision and site plan development to plant or preserve a minimum percentage of tree canopy based on the zoning district. For individual residential lots under 40,000 square feet, a property owner may generally remove a private tree without a county permit, but HOA covenants, site plan conditions, and any recorded forest conservation easements may impose additional restrictions that survive from the original development approval.

Key details: Forest Conservation: Chapter 22A -- lots 40,000+ sq ft. Roadside Trees: Chapter 49 -- dual permit (county + DNR). Tree Canopy Law: Chapter 55 -- canopy targets for development. Canopy Goal: 70% countywide. Free Trees: Tree Montgomery program for residents.

Removing a roadside tree without permits: fine up to $500 per tree plus full replacement cost. Forest Conservation Law violations: up to $500 per tree removed in violation, mandatory replacement planting, stop-work orders on the development, and potential denial of future permits. Violation of a recorded forest conservation easement: county enforcement action and potential legal action by the Planning Board.

This is not one of those rules that cities tend to ignore. Gaithersburg actively enforces its tree removal & heritage trees requirements.

Rainwater Harvesting

Rainwater harvesting is legal and actively encouraged in Gaithersburg and throughout Maryland. The state offers a Rain Barrel Tax Credit that provides a subtraction modification on Maryland state income tax for the cost of purchasing and installing qualifying rain barrels. Montgomery County promotes rain barrel installation as part of its Chesapeake Bay watershed stormwater management strategy. No permit is required for standard residential rain barrels (typically 55 gallons) connected to gutter downspouts. WSSC charges a Water Quality Protection Charge (WQPC) based on the amount of impervious surface on a property, and homeowners who install rain barrels, rain gardens, or other on-site stormwater management practices may qualify for a credit reducing their annual WQPC assessment. The county RainScapes Rebate Program offers financial incentives of up to $2,500 per residential property for stormwater management projects including rain barrels, rain gardens, permeable pavement, dry wells, and conservation landscaping with native plants. These programs reflect the strong policy emphasis on reducing stormwater runoff to protect the Chesapeake Bay.

Key details: Legal Status: Legal and actively encouraged. Permit Needed: No (standard residential barrels). State Incentive: MD Rain Barrel Tax Credit. County Program: RainScapes rebates up to $2,500. Stormwater Credit: WQPC reduction for on-site management.

There are no penalties for rainwater harvesting in Maryland. Failure to maintain rain barrels in good condition -- specifically allowing standing water to become a mosquito breeding habitat -- could trigger nuisance enforcement under county health or property maintenance codes. Overflow connections should be properly directed to prevent water damage to neighboring properties.

Gaithersburg is more permissive than most cities when it comes to rainwater harvesting. That said, there are still limits.

Artificial Turf

Gaithersburg does not prohibit artificial turf on residential properties, and no city or Montgomery County ordinance specifically bans or restricts synthetic grass installation for homeowners. No building permit is typically required for residential artificial turf unless the installation involves significant grading or drainage modifications. However, several practical considerations affect Gaithersburg homeowners considering artificial turf. Depending on the drainage backing material, artificial turf may be classified as impervious or semi-impervious surface, which could affect stormwater management calculations if the turf area combined with existing impervious surfaces (driveway, patio, roof footprint) exceeds county Environmental Site Design (ESD) thresholds for the lot. Large turf installations may also trigger adjustments to the WSSC Water Quality Protection Charge. Many Gaithersburg neighborhoods are governed by HOAs with architectural review requirements that may restrict or require approval for artificial turf installation, so checking community covenants before purchasing materials is essential. Unlike drought-prone western states, Montgomery County does not offer water conservation rebates for artificial turf since the region generally has adequate rainfall.

Key details: City Ban: None -- artificial turf allowed. Permit: Not typically required for standard installation. Stormwater Impact: May count as impervious surface for ESD. HOA: Approval may be required -- check covenants.

No specific artificial turf violation exists. Stormwater runoff problems caused by improper installation (directing concentrated runoff onto neighboring properties or public infrastructure) may trigger county environmental enforcement. HOA covenant violations for unapproved installations are handled by the homeowners association through their own enforcement process.

If you are coming from a city with tighter rules, you will find Gaithersburg gives residents more flexibility on artificial turf.

Weed Ordinances

Weeds and rank vegetation exceeding 12 inches in height are prohibited on all properties within Gaithersburg under Montgomery County Code Chapter 26 (Section 26-9). The Gaithersburg Neighborhood Services division enforces weed and vegetation complaints on owner-occupied and commercial properties within city limits, while the county Department of Housing and Community Affairs (DHCA) handles rental properties. The enforcement process follows the same notice-and-abatement procedure used for grass height violations: a written notice with a 7 to 14 day compliance window, followed by city or county abatement at the owner's expense if not corrected. Separately and significantly, the Montgomery County Pesticide Law (Bill 52-14, effective January 1, 2018) restricts the use of cosmetic (non-essential) pesticides on lawns, playgrounds, mulched areas, and childcare facilities throughout the county, including Gaithersburg. This means many conventional weed-killing herbicides such as glyphosate-based products cannot be applied on residential lawns. Organic and EPA 25(b) exempt-product alternatives must be used instead for routine lawn weed control, fundamentally changing how Gaithersburg homeowners manage weeds.

Key details: Max Weed Height: 12 inches. Code: Chapter 26, Sec. 26-9. Pesticide Law: Bill 52-14 restricts cosmetic pesticides on lawns. Weed Control: Organic or 25(b) exempt products required.

Weed height exceeding 12 inches: written notice to correct within 7 to 14 days. City or county abatement at owner's expense if not corrected; cost becomes a lien on property. Pesticide Law violations (applying prohibited herbicides on lawns): fines enforced by county DEP. Professional applicators face additional licensing penalties.

Water Restrictions

Gaithersburg is served by WSSC Water (Washington Suburban Sanitary Commission), the bi-county water and sewer utility for Montgomery and Prince George's counties. Mandatory outdoor watering restrictions activate during drought emergencies declared by the Maryland Department of the Environment (MDE) under COMAR 26.03.04. Outside of declared drought conditions, no permanent watering schedule is imposed on Gaithersburg residents, unlike many western and southern cities that enforce year-round irrigation schedules. During a drought watch, voluntary conservation is requested. During a drought warning, odd-even address watering schedules may take effect. During a full drought emergency, all non-essential outdoor water use is prohibited, including lawn irrigation, car washing, and filling swimming pools. WSSC may also impose excess-use surcharges during declared emergencies. Gaithersburg falls entirely within the Chesapeake Bay watershed, which adds an environmental conservation dimension to all water management and fertilizer policies under the Maryland Fertilizer Use Act of 2011.

Key details: Water Utility: WSSC Water (Potomac and Patuxent supply). Normal Conditions: No mandatory watering schedule. Drought Watch: Voluntary conservation requested. Drought Emergency: All non-essential outdoor water use banned. Watershed: Chesapeake Bay (Great Seneca Creek).

Violating mandatory drought watering restrictions: WSSC surcharges on excess use and potential fines. MDE drought emergency orders carry enforcement authority under COMAR 26.03.04 and can include penalties for willful non-compliance. Fertilizer application violations under the MD Fertilizer Use Act: fines enforced by MDA.

Tree Trimming

Trees overhanging public sidewalks and streets in Gaithersburg must maintain a minimum clearance of 8 feet above sidewalks and 14 feet above streets to ensure safe passage for pedestrians and vehicles. Property owners are responsible for trimming their own trees that encroach into these clearance zones, even if the trunk is on private property. Roadside trees planted within the public right-of-way along county-maintained roads are regulated under Montgomery County Code Chapter 49 (Roadside Trees) and require a permit from the county Department of Transportation before any cutting, trimming, or removal work is performed. A concurrent permit from the Maryland Department of Natural Resources is also required for roadside tree work under the state Roadside Tree Law (Natural Resources Article 5-406). Private trees on residential property can generally be trimmed without a government permit, as long as the work does not kill the tree and does not involve a specimen tree protected under the Forest Conservation Law (Chapter 22A). Utility companies including Pepco and BGE maintain their own trimming rights along power line corridors.

Key details: Sidewalk Clearance: 8 feet minimum. Street Clearance: 14 feet minimum. Roadside Trees: County DOT + MD DNR permit required. County Code: Chapter 49 (Roadside Trees). State Law: Natural Resources Article 5-406.

Unauthorized cutting or trimming of a roadside tree without required permits: fine up to $500 per tree. Killing or severely damaging a protected tree: replacement planting at 1-inch caliper per 1-inch diameter removed, plus potential fines. Failure to maintain sidewalk or street clearance after notice: city or county performs work at owner's expense.

The Bottom Line

Compared to many U.S. cities, Gaithersburg gives residents more room on landscaping rules. 3 of the 8 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

These rules come from Gaithersburg's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.