At a glance
- Region ID: MID-ATLANTIC
- Anchor cities: New York, Philadelphia, Washington DC
- USDA Hardiness Zones: 6b–7b
- Soil: Varies dramatically — sandy coastal, clay piedmont, loamy river valleys
- Catalog size: 93 plants
- Common containers: 3-gallon for shrubs and perennials, 7–15 gallon or B&B for trees
Pruning & maintenance calendar
Anchored to plants with full care profiles. As more profiles are added, this calendar fills out. Generated from per-plant data in our public catalog.
January – Mid-February
Late winter dormant pruning of crape myrtle (cold-hardy cultivars only — north of zone 7a, crape myrtle dies back annually and is treated as a die-back shrub).
Late February – Mid-March
Annual Knock Out rose pruning, after forsythia bloom but before bud break. Inspect every cane for rose rosette symptoms before cutting; remove and bag any showing witch's broom or excessive soft thorns.
Early to Mid-March
Cut back liriope to 2–3 inches before new growth pushes. Selective thinning of American boxwood for air circulation; sanitize tools between plants in blight-confirmed areas.
March
April – Early May
Post-bloom pruning of Eastern redbud if structural work is needed (blooms on old wood — pruning earlier removes flowers).
Late July – Early August
Post-bloom pruning of traditional bigleaf hydrangea. Cut spent flowers back to the first strong bud pair below the bloom.
August – October
Structural cuts on young red maple, Freeman maple, and river birch — summer cuts heal cleanly and avoid the sap-bleed problem of late-winter pruning. Establish single central leader; remove co-dominant stems aggressively in the first 10 years.
Regional pest & pathogen pressure
What's actively pressuring plants in this region right now — diagnostic notes only.
- Rose rosette virus — confirmed and widespread. Tell: excessive soft thorns on new canes, witch's broom of distorted shoots, reddened rubbery new growth that fails to harden off.
- Japanese beetle — annual heavy pressure mid-summer. Tell: skeletonized leaves and shredded blooms on roses, crape myrtle, linden, and many other landscape plants. Adults emerge late June into July; cycle tied to prior-year grub conditions in nearby turf.
- Boxwood blight — established and pressure heavy. Tell: dark circular leaf spots, rapid defoliation working from the bottom up, black streaking on green stems.
- Boxwood leafminer — chronic seasonal pressure. Tell: blistered orange-yellow patches on leaf undersides; adult fly emerges with weigela bloom.
- Deer pressure — moderate to heavy throughout suburban corridors. Affected most: hosta, daylily, Knock Out rose, tulip, yew. Generally avoided: boxwood, liriope, ornamental grasses, most ferns.
- Iron chlorosis on river birch — common in landscapes amended with limestone or built on naturally alkaline soil. Yellow leaves with green veins.
- Sap bleed on late-winter maple cuts — cosmetic but the single most common client phone call of the season. Schedule maple pruning August through October.
- Tar spot — common on red maple and Freeman maple in wet summers. Cosmetic only.
Core staples (commonness 1)
Detailed care profiles for plants on the trade truck across the Mid-Atlantic. Pruning windows, identification-grade pest and pathogen notes, cultural fundamentals.
Currently: 11 of 28 core staples profiled. The remaining plants in this region are tracked in the catalog data with botanical and container info pending care notes.
Eastern Redbud
Core staplePruning — immediately after bloom (April – early May)
Blooms on old wood. Pruning during dormancy removes flower buds and reduces the following spring's display. Young trees benefit from intentional structural pruning to establish either a single leader or a multi-trunk form; left alone, redbud tends to form weak multi-trunk structures with included bark.
Cultural notes
Native to the eastern US and one of the most reliable native ornamental trees in the trade. Tolerates clay soils, partial shade, and urban conditions. Surface roots are shallow — avoid cultivation near the base. Short-lived for a tree (30–50 year landscape lifespan). White-flowered (Alba), purple-leaved (Forest Pansy), and weeping (Lavender Twist) cultivars expand the design palette.
Common pests & pathogens
Pest Two-marked treehopper
Slits in twigs and small branches where females insert eggs; weakened branches may snap in storms. White waxy egg masses visible in fall and winter.
Disease Botryosphaeria canker
Sunken, discolored bark patches on branches and trunk; affected branches wilt and die back. Common opportunistic pathogen on stressed redbuds — drought, transplant stress, and mechanical injury all increase susceptibility.
Disease Verticillium wilt
One-sided branch dieback and wilt; vascular streaking in cut sapwood. Soil-borne and effectively incurable. Avoid replanting redbud in soil where another verticillium-susceptible tree (maple, smoke tree) has died.
Red Maple
Core staplePruning — late summer or early fall (August – October)
Late-summer cuts avoid the heavy sap bleeding that follows late-winter pruning as sap rises. Bleeding is cosmetic, not harmful, but alarms clients. Young trees require structural pruning to establish a single central leader. Co-dominant leaders are the most common long-term structural failure mode in suburban Acer rubrum — branches included in tight V-crotches split in storms a decade or two later.
Cultural notes
Cultivar selection drives long-term performance. October Glory and Red Sunset are the trade standards for reliable red fall color and structural form. Chlorosis (yellow leaves with green veins) in alkaline soils is common — Acer rubrum prefers slightly acidic soil. Surface roots compete with turf at maturity; mulch ring rather than fight for grass.
Common pests & pathogens
Disease Verticillium wilt
Sudden one-sided branch dieback and wilt in mid-summer. Diagnostic tell: dark olive-green to brown vascular streaking visible when bark is peeled back on a dying branch. Soil-borne and effectively incurable.
Disease Anthracnose
Irregular brown blotches following leaf veins, particularly in cool wet springs. Defoliates lower canopy but trees re-foliate later in the season.
Disease Tar spot
Large, raised black spots on leaves in late summer. Cosmetic only — no impact on tree health.
River Birch
Core staplePruning — mid-summer (June – August)
Like all birches, river birch bleeds heavily from late-winter and spring pruning wounds as sap rises. Bleeding is cosmetic but alarming and persists for weeks. Multi-trunk specimens are typically planted in groups of three trunks per location, creating the layered exfoliating bark display the species is grown for. Single-trunk training is less common but valid; structural pruning in the first 5 years sets the form.
Cultural notes
Native to the Southeast and increasingly planted nationwide as a borer-resistant alternative to white birch. Tolerates wet soils naturally but also handles average garden conditions. Heritage and Dura-Heat are the trade-standard cultivars for best exfoliating bark display. Mid-summer leaf drop is normal during drought — the tree thins its own canopy to conserve water and re-leafs after rain returns.
Common pests & pathogens
Pest Aphids
Honeydew dripping from canopy in early summer; sticky residue on cars, decks, and turf under the tree. Cosmetic but a major homeowner complaint when river birch is planted over patios or driveways.
Disease Iron chlorosis
Yellow leaves with green veins, progressing to bleached cream-colored foliage and leaf drop. Caused by inability to uptake iron in high-pH soils. River birch is one of the more pH-sensitive landscape trees — alkaline soils (above pH 6.8) reliably produce chlorosis.
Freeman Maple
Core staplePruning — late summer or early fall (August – October)
A hybrid of red maple (Acer rubrum) and silver maple (Acer saccharinum), bred to combine red maple's fall color with silver maple's faster growth. Inherits silver maple's tendency toward co-dominant leaders and included bark — aggressive structural pruning in the first 10 years is critical. Branch attachments fail in storms more frequently than red maple.
Cultural notes
Autumn Blaze (most-planted cultivar) and Sienna Glen are the trade standards. Faster-growing than pure red maple but with more brittle wood — storm damage is common at maturity. Some municipal arborists are moving away from Autumn Blaze due to structural concerns; Celebration and Marmo cultivars offer better structure.
Common pests & pathogens
Pest Cottony maple scale
White cottony egg masses on twigs and undersides of branches. Honeydew and sooty mold on bark and leaves below. Heavy infestations stress young trees.
Disease Verticillium wilt
Sudden one-sided branch dieback and wilt in mid-summer. Vascular streaking visible when bark is peeled back on a dying branch. Soil-borne and effectively incurable.
Bigleaf Hydrangea
Core staplePruning — immediately after bloom (late July / early August)
Traditional H. macrophylla blooms exclusively on old wood. Late-fall or early-spring pruning removes the flower buds and produces a green plant that won't bloom that year — the single most common “why didn't my hydrangea bloom?” diagnostic call. Cut spent flowers back to the first pair of strong buds below the bloom. Reblooming cultivars (Endless Summer, BloomStruck) bloom on both old and new wood — light removal of obviously dead wood in early spring is acceptable for these only.
Cultural notes
Bloom color in pink/blue cultivars is pH-driven — acidic soil (below pH 6) yields blue, alkaline soil (above pH 6.5) yields pink. White cultivars do not shift. Mid-day wilt in full sun, even with adequate water, is normal and recovers overnight. Cold-zone bloom failure is typically winter bud kill rather than pruning error.
Common pests & pathogens
Disease Cercospora leaf spot
Circular tan-to-brown spots with purple halos, starting on lower leaves and progressing upward through the season. Cosmetic but disfiguring late in the growing season.
Disease Botrytis (gray mold)
Fuzzy gray-brown patches on flowers, especially in cool wet springs. Affects bloom quality and shortens bloom display; rarely affects plant health.
Crape Myrtle
Core staplePruning — late winter, before bud break
Cut back to lateral branches at the trunk or to outward-facing buds. Annual heavy topping ruins natural form, reduces bloom quality, and produces weakly attached suckers. North of zone 7a, crape myrtle frequently dies back to the ground in hard winters and regrows as a multi-trunk shrub the following spring — a normal regional pattern, not a planting failure.
Cultural notes
Full sun is non-negotiable for bloom production and disease resistance. The National Arboretum “Indian Tribes” series (Natchez, Tuscarora, Miami, Tonto) was bred for cold tolerance and mildew resistance. Bloom production is noticeably lighter than in the Southeast.
Common pests & pathogens
Pest Japanese beetle
Skeletonized leaves in mid-summer. Feeding tends to concentrate on the upper, sunlit canopy.
Disease Powdery mildew
White powdery coating on new growth, flower buds, and stem tips. Varietal resistance varies dramatically — Indian Tribes series cultivars bred for resistance.
Knock Out Rose
Core staplePruning — late winter (after forsythia bloom, before bud break)
Cut back to roughly one-third to one-half of mature size for annual maintenance. Remove crossing canes and any canes showing rose rosette symptoms at the base, and sanitize tools between cuts on different plants. Older plants benefit from removing one or two oldest canes to ground level each year.
Cultural notes
Originally marketed as “disease-resistant.” That claim was accurate for black spot at introduction in 2000; rose rosette virus has changed the practical picture entirely. Inspect plantings every two to three weeks for rosette symptoms during the growing season. Avoid interplanting with multiflora rose (the wild RRV reservoir) where possible.
Common pests & pathogens
Disease Rose rosette virus (RRV)
Diagnostic symptoms include excessive thorniness on new canes (covered in tiny soft thorns), witch's broom proliferation of distorted shoots, reddened or “rubbery” new growth that doesn't harden off, and elongated buds that fail to open. Spread by a microscopic eriophyid mite. There is no cure — affected plants are typically removed, including the root system.
Pest Japanese beetle
Heavy summer damage to foliage and blooms. Skeletonized leaves and shredded flowers. Adults emerge in late June into July.
Disease Black spot
Circular black spots with fringed margins on leaves, progressing to yellowing and defoliation from the bottom up.
Hosta
Core staplePruning — late fall or early spring (cut dead foliage to ground)
Slugs and snails overwinter in old foliage piled around crowns; fall cleanup significantly reduces spring slug pressure. Divide every 4–6 years in early spring or fall to maintain vigor — large clumps decline in foliage quality and develop dead centers. Some collectors prefer never-divided clumps for the massive specimen effect.
Cultural notes
Shade-garden workhorse across cold and temperate regions. Performs best in dappled to deep shade with moist well-drained soil. Full sun causes leaf scorch on most cultivars; sun-tolerant cultivars (Sum and Substance, Guacamole, August Moon) handle morning sun.
Common pests & pathogens
Pest Slugs and snails
Irregular holes in leaves, slime trails visible across foliage in morning. Damage progresses through the growing season; worse in shaded irrigated sites and during wet springs. The defining hosta pest.
Pest Deer
Severe browsing on foliage; entire clumps reduced to stubs overnight in deer-pressure areas. Hosta is the deer's favorite landscape ornamental — not deer resistant despite occasional trade claims.
Disease Hosta virus X (HVX)
Mottled, twisted, lumpy foliage with ink-bleed patterns along veins. No cure. Infected plants must be removed (roots and all) to prevent spread on tools. Confirmed in commercial nursery stock throughout the US; inspect new acquisitions carefully.
Daylily
Core staplePruning — early spring (remove old foliage before new growth)
Cut all dead and yellowed foliage to ground level in late winter before new growth pushes — old foliage harbors thrips and disease over winter. Remove spent flower stalks (scapes) at the base through the bloom season. Divide every 3–5 years to maintain vigor.
Cultural notes
Tolerates a wide range of soils and sun exposures. Full sun produces best bloom. Drought-tolerant once established but blooms better with regular moisture. Stella d'Oro and Happy Returns are the trade workhorses; reblooming reliability varies significantly by region and cultivar.
Common pests & pathogens
Pest Deer
Heavy browsing pressure on foliage and especially flower buds. Daylilies are a deer-magnet plant — not deer resistant despite occasional trade claims.
Pest Thrips
Streaked, distorted blooms and silvery feeding scars on petals and foliage. Tiny slender insects visible inside flower buds.
Disease Daylily rust
Yellow-to-orange powdery pustules on undersides of leaves, with yellow streaks visible on top surfaces. Spreading northward seasonally on infected nursery stock.
Big Blue Lily Turf (Liriope)
Core staplePruning — late winter (February – early March)
Mow or string-trim entire planting to 2–3 inches above the crown once a year before new growth pushes. Cutting after new growth has emerged shears off the year's first push and leaves the planting ragged for weeks.
Cultural notes
Workhorse evergreen perennial across the Mid-Atlantic — border edging, mass groundcover, bed edging. Tolerates full sun to deep shade. Liriope spicata spreads aggressively by rhizomes and is regulated as invasive in some Mid-Atlantic states — confirm species (muscari, not spicata) before planting near natural areas. Variegated cultivars (Variegata, Silvery Sunproof) slightly less vigorous than green forms.
Common pests & pathogens
Pest Voles
Tunnel damage around root zones, especially in winter under mulch. Foliage thinning and entire clumps dying back without visible above-ground cause.
Disease Anthracnose
Reddish-brown leaf tip dieback, progressing down the blade. Worse in irrigation-heavy plantings and dense crowded clumps.
Southern Magnolia (cold-hardy cultivars)
Core staplePruning — minimal; late winter to early spring for light shaping
Resents heavy pruning — natural pyramidal form is the strongest structural form. Limbing up to expose the trunk creates a permanent gap because magnolia does not bud reliably from old wood. Leaves drop continuously throughout the year (not in one fall flush) — clients unfamiliar with the species often misread this as decline.
Cultural notes
In the Mid-Atlantic, only cold-hardy cultivars perform reliably: Bracken's Brown Beauty, D.D. Blanchard, and Edith Bogue survive zone 6b–7a winters where the species form struggles. Little Gem (compact, 20 ft) is the most-planted cultivar nationally and a different design plant from the full-size species form. Bronze leaf undersides distinguish most cold-hardy cultivars at a glance.
Common pests & pathogens
Pest Magnolia scale
Large soft brown or pinkish scales on twigs and undersides of branches — among the largest scale insects in the landscape. Heavy honeydew and sooty mold below.
Disease Algal leaf spot
Round, raised, velvety green-to-orange spots on leaf surfaces. Caused by a parasitic alga rather than a fungus. Cosmetic primarily.
American Boxwood
CommonPruning — late winter to early spring, before new growth (typically March)
Selective thinning of interior branches improves air circulation and reduces blight pressure significantly more than surface shearing alone. Sheared-only boxwoods develop a dense outer canopy with dead interior — a classic blight-favoring pattern. Sanitize tools between plants in any blight-confirmed area.
Cultural notes
Shallow-rooted — mulch matters more than for most shrubs. Soil pH preference is 6.5–7.2 — chlorosis in acidic soils is common. Winter desiccation in zones 5–6 produces orange-bronze foliage that greens up in spring; not the same as blight.
Common pests & pathogens
Disease Boxwood blight
Dark circular leaf spots progressing to rapid defoliation, working from lower branches upward. Black streaking on green stems is the diagnostic tell. Established and pressure heavy throughout the Mid-Atlantic. NewGen series cultivars (Independence, Freedom) bred for resistance.
Pest Boxwood leafminer
Blistered, raised orange-yellow patches on leaf undersides. Adult fly emerges in mid-spring at the same time as weigela bloom.
Inside the app
Skip the spreadsheet. Verdant Meridian seeds your library with the regional palette on day one.
Pick your region at onboarding — the app loads the commonness-1 and commonness-2 plants for your market into your element library, ready to drop onto a measured shape and price.
Try Free — 30 DaysHow this list was built
Compiled from regional wholesale grower availability lists — not retail garden references. If the regional wholesale trade grows it, it's included.
Commonness rating:
- 1 — Core staple on every truck, specified constantly.
- 2 — Common regularly stocked and used.
- 3 — Available, sold in region, used selectively.
Pruning windows, pest and pathogen identification notes are drawn from regional Cooperative Extension publications and trade horticulture references. No chemical, fungicide, or product recommendations appear anywhere in this database. Diagnostic and cultural information only.
FAQ
What USDA hardiness zone is New York City and Philadelphia?
New York City sits in USDA Zone 7a–7b depending on neighborhood and elevation. Philadelphia is 7a–7b. Washington DC is 7a–7b. The broader Mid-Atlantic region spans Zones 6b through 7b — moderate winter lows of 0°F to 5°F, hot humid summers, four distinct seasons.
When should I prune red maple in the Mid-Atlantic?
Late summer or early fall — August through October. Late winter pruning bleeds heavily as sap rises, which is cosmetic but alarming to clients. Young trees need structural pruning to establish a single central leader.
Is rose rosette virus a problem in the Mid-Atlantic?
Yes. Rose rosette virus is widespread throughout the Mid-Atlantic. Wholesale replacement of established Knock Out plantings is common. Watch for excessive thorniness on new canes, witch's broom of distorted shoots, and reddened rubbery new growth.
Do deer eat hosta and daylily?
Yes — both are heavily browsed by deer in the Mid-Atlantic. Despite occasional trade claims to the contrary, hosta and daylily are deer-magnet plants. In high-pressure areas, both can be reduced to stubs overnight.
Will boxwood blight kill my boxwoods in Maryland or Virginia?
Boxwood blight is established and pressure is heavy throughout the Mid-Atlantic. Diagnostic symptoms include dark circular leaf spots progressing to rapid defoliation working from lower branches up, with black streaking on green stems. NewGen series cultivars (Independence, Freedom) were bred for resistance.
Cite this page
Verdant Meridian, “Mid-Atlantic Plant Palette,”
verdantmeridian.app/regions/mid-atlantic, updated May 2026. CC-BY-4.0. Raw data: /data/plants.json.
This database is published under Creative Commons Attribution 4.0. Free to use, redistribute, and build on — attribution required.
