Rockville's Landscaping Rules: The Rules That Matter

Every city handles landscaping rules a little differently. In Rockville, Maryland, there are 8 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Water Restrictions

Rockville is served by WSSC Water (Washington Suburban Sanitary Commission), which imposes mandatory outdoor watering restrictions during drought conditions. When mandatory restrictions are in effect, all outdoor water use is banned including lawn watering, filling pools, and washing outdoor surfaces, with violations subject to $500 fines enforced through Montgomery County.

Key details: Water Provider: WSSC Water. Drought Fine: $500 per violation. Normal Conditions: No standing watering schedule. Rebate Program: RainScapes - up to $5,000.

During mandatory water restrictions, violations of the outdoor watering ban can result in a $500 fine per occurrence. Violations can be reported through Montgomery County's 311 service. WSSC Water enforcement personnel may also issue citations. Repeat violations during drought emergencies may result in additional penalties.

Artificial Turf

Rockville does not have a specific ordinance prohibiting or restricting residential artificial turf installation. Artificial turf is generally permitted on private residential property, though it may be subject to review in historic districts and planned development zones under the city's landscaping and exterior alteration guidelines.

Key details: Specific Ordinance: None for residential artificial turf. Permit Required: Generally no. Historic Districts: May require exterior alteration review. Stormwater Credit: Does not qualify.

There are no specific penalties for installing artificial turf in Rockville. If installation alters drainage and causes stormwater problems for neighboring properties, standard code enforcement provisions may apply. Installations in historic districts without required review may be subject to correction orders.

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

Native Plants

Rockville encourages native plant use in residential landscaping through its RainScapes program and forest conservation initiatives. The city maintains a species list for approved plantings and encourages Chesapeake Bay-friendly landscaping practices. Native plant gardens are exempt from the 10-inch vegetation height limit when maintained as cultivated gardens.

Key details: City Stance: Encouraged through RainScapes. Rebates: Up to $5,000 for conservation landscaping. Height Exemption: Cultivated gardens exempt from 10-inch limit. Species Guidance: City maintains species restriction list.

Native plant gardens maintained as cultivated landscapes are not subject to weed height violations. However, if a native planting is not clearly maintained and appears to be an overgrown or abandoned lot, code enforcement may issue a notice. Communication with the city about intentional native plantings can prevent enforcement issues.

The rules around native plants in Rockville lean permissive, but that does not mean anything goes.

Rainwater Harvesting

Maryland law permits rainwater harvesting for non-potable uses, and Rockville actively encourages it through the RainScapes Rebate Program, which provides rebates of up to $5,000 for rain barrels, cisterns, and other stormwater management installations. No city permit is required for standard rain barrels.

Key details: Legality: Fully legal and encouraged. Rebate Available: Up to $5,000 through RainScapes. Permit Required: No, for standard rain barrels. Indoor Use: Non-potable only (toilet, laundry, cleaning). Watershed: Chesapeake Bay via Rock Creek/Potomac.

There are no penalties for collecting rainwater in Rockville. Installing a large cistern without a required building permit for oversized accessory structures may result in standard code enforcement action. Improper cross-connections with the potable water supply without backflow prevention may result in plumbing code violations enforced by WSSC Water.

The rules around rainwater harvesting in Rockville lean permissive, but that does not mean anything goes.

Tree Removal & Heritage Trees

Rockville's Forest and Tree Preservation Ordinance (Chapter 10.5) requires a Significant Tree Removal Permit for removal of any tree with a diameter exceeding 4 inches measured 12 inches above ground, or any flowering tree exceeding 2 inches in diameter. Removed trees must be replaced according to city-established mitigation rates.

Key details: Code Section: Chapter 10.5 FTPO. Permit Threshold: Trees exceeding 4 inches diameter (12 inches above ground). Flowering Trees: Exceeding 2 inches diameter. Replacement Required: Yes, per Section 10.5-23(a)(1) rates. Recent Amendment: Ordinance 01-26 (January 2026).

Removing a significant tree without a permit is a violation of Chapter 10.5 subject to fines and mandatory replacement planting at enhanced mitigation rates. Stop-work orders may be issued on construction projects that damage protected trees. The City Forester determines appropriate mitigation, which may include replacement trees, payment into the city's forest conservation fund, or both.

Compared to other cities, Rockville takes a harder line on tree removal & heritage trees. The enforcement and penalty structure reflects that.

Grass Height Limits

Rockville's Property Maintenance Code (Chapter 5, Article XII) requires all areas including public rights-of-way adjacent to the property to be kept free from weeds or plant growth in excess of 10 inches. Weeds are defined as all grasses, annual plants, and vegetation other than trees, shrubs, cultivated flowers, and gardens.

Key details: Maximum Height: 10 inches. Code Section: Chapter 5, Article XII. Applies To: Property and adjacent right-of-way. Exemptions: Trees, shrubs, cultivated flowers, gardens.

Failure to maintain vegetation below 10 inches triggers a code enforcement notice with a deadline to correct. Continued non-compliance may result in fines. In persistent cases, the city may arrange for mowing and bill the property owner for the cost plus administrative fees. Violations are processed through the city's Community Enhancement Code Enforcement division.

Weed Ordinances

Rockville's Property Maintenance Code (Chapter 5, Article XII, Section 5-287) requires property owners to keep all areas free from weeds or plant growth in excess of 10 inches. The ordinance defines weeds as all grasses, annual plants, and vegetation other than trees, shrubs, cultivated flowers, and gardens.

Key details: Code Section: Chapter 5, Article XII, Section 5-287. Maximum Height: 10 inches. Definition: All grasses, annual plants, and vegetation (excluding trees, shrubs, gardens). Enforcement: Community Enhancement Code Enforcement.

Initial violations result in a notice requiring correction within a specified timeframe. Continued non-compliance may lead to escalating fines. The city may arrange for professional clearing of overgrown lots and charge the property owner for the cost plus administrative fees. Chronic violators may face repeated citations and accumulating penalties.

Tree Trimming

Rockville's Forest and Tree Preservation Ordinance (Chapter 10.5) prohibits residents from pruning, removing, or conducting any tree care on trees located in the public right-of-way or city parks without authorization. Private trees may be trimmed by the property owner, but any work affecting significant trees requires compliance with city forestry standards.

Key details: Code Section: Chapter 10.5 FTPO. Public Trees: City authorization required for any work. Significant Tree: 4+ inches diameter at 12 inches above ground. Enforcement: City Forester and MD DNR Forest Service. Private Trees: Owner may trim with proper practices.

Unauthorized pruning or damage to public trees can result in fines and required mitigation under the FTPO. The Maryland DNR Forest Service may also enforce violations related to roadside trees. Damage to significant trees during construction can trigger stop-work orders and mandatory replacement planting requirements.

Compared to other cities, Rockville takes a harder line on tree trimming. The enforcement and penalty structure reflects that.

The Bottom Line

Compared to many U.S. cities, Rockville 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 Rockville's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.