B08f_Attachment_5_-_Exhibit_5_-_Horticulture_Information_Guide.pdf

HORTICULTURE

INFORMATION & GUIDE

WASHINGTON, D.C.

Ho rt i c ulture Info rmatio n & G uide Pershing Park: The National World War I Memorial

Created and submitted by DAVID RUBIN Land Collective, LLC

SITE HISTORY

The National WWI Memorial sits within a revivified Pershing Park, a 1980s era civic space designed by M. Paul Friedberg that married the commemoration of General John J. Pershing with the overall design goals of the Pennsylvania Avenue National Historic Site. The original site featured design elements typical for the time period: a living fountain that doubled as an ice rink in the winter, ample room for seating, a service kiosk, and a grading scheme that served to remove the site interior from the busy streetscape surrounding the parcel. The original planting scheme, designed by Oehme van Sweden, featured lush grasses, flowering perennials, and a mix of understory and canopy trees that offered four season interest.

Upon its selection as the site of the future National WWI Memorial, it was realized that the site would need to manage change in a way that pulled ideas from the original park’s design intent and shaped them into a space that is contemplative and appropriate to a memorial. As Pershing Park is still an urban park within the Pennsylvania Avenue corridor, it serves the public on a day to day basis in addition to Memorial related services and functions. The planting scheme utilizes Oehme van Sweden’s original planting plan as site precedent, reestablishing similar species in areas such as the south, west, and upper terraces, but adjusts other areas such as the lower terrace to reorient visitors towards the Memorial. The resultant design is elegantly simple and easy to maintain, with easily identifiable character within each planting zone that is contextually appropriate to both Memorial and urban public space.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

PENNSYLVANIA AVENUE NW

14TH S

TREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

PL ANTING ZONES

1. PENNSYLVANIA AVENUE PL ANTERS

2. PERSHING PL AZA

3. UPPER TERRACE

4. LOWER TERRACE

5. LOWER PL AZA

6. NORTH & EAST BERM PL ANTERS

7. ENTRY PATHS

8. BERMS

BELVEDERE/ GROVE

EAST BERM

PERSHING

PLAZA

PENNSYLVANIA AVENUE NW

T

H S

T R

E E

T N

W

PA AVENUE

PLANTERS

UPPER

TERRACE

SOUTH

TERRACE

WEST

TERRACE

4 EAST

LOWER

PLAZA

NORTH LOWER

PLAZA

6 NORTH BERM

PLANTERS

EAST BERM

PLANTERS

7 ENTRY PATHS

SOUTH BERM8

WEST

BERM

NORTH

BERM

This document is intended to supplement horticultural maintenance of the Memorial site. Descriptions of plant material, seasonal imagery, and suggested plant maintenance are included to ensure the design intent for this culturally important space is met. The overall planting strategy utilizes a limited palette that welcomes visitors into the Memorial and establishes distinct experiential zones within the site. As the National World War I Memorial, it is expected that the site be kept pristine, with planting areas free of weeds and debris and spent flowerheads removed at the appropriate time.

SITE DESCRIPTION

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Pennsylvania Avenue Planters (1), North & East Berm Planters (6), Entry Paths (7)

PERENNIAL

An emo ne x hybrida ‘Ho no rine Jo bert’ Honorine Jober t Japanese Anemone

SPRING SUMMER FALL WINTER

A late summer blooming herbaceous perennial with a multitude of pure white flowers on graceful, branching upright stems for five weeks or more, above a solid clump of dark green deeply cut leaves. Prefers full to partial direct sunlight with regular water to maintain evenly moist soil. Utilize shredded leaf mulch (see pg. 12) to keep roots cool and preserve moisture, avoiding the crown. Water deeply, regularly during first growing season to establish an extensive root system. Leaves blacken by frost, so cut to the ground in late fall. Anemone will produce small tufts at the base in early winter that will grow into new leaves in the spring. Transplanting is best done in the spring. Anemone benefit from a general purpose fertilizer or compost in late fall to late winter.

MAINTENANCE

DESCRIPTION

Anemone x hybrida ‘Honorine Jobert’ (Honorine Jobert Japanese anemone), vigorous fibrous-rooted mounding compact Japanese anemone hybrid cultivar which typically grows to 3-4’ tall and spreads by creeping rhizomes, flowers are single 2-3” diameter with 6-9 overlapping white petaloid sepals and yellow center stamens appearing on long wiry-but-graceful branching stems over an attractive foliage mound of trifoliate dark green leaves, lengthy Aug.-Sept. bloom period.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Pennsylvania Avenue Planters (1), North & East Berm Planters (6)

Asaru m Splendens Asian Ginger

SPRING SUMMER FALL WINTER

Asarum splendens, commonly called Chinese wild ginger, is a low-growing, rhizomatous, semi-evergreen to herbaceous perennial. Mature clumps will reach up to 8” tall and spread to fill a 1.5’ area. This silver-splashed, evergreen beauty brightens any shady niche. Large glossy heart-shaped foliage conceals unusual purple flowers tucked around the base of the plant in early spring.

MAINTENANCE

DESCRIPTION

Best grown in evenly moist, humusy, rich, well-draining loams in part sun to part shade. Tolerant of a relatively wide range of soil pH levels, but intolerant of poorly drained or dry soils. Hardy in Zones 5-9. Will remain semi-evergreen in the warmer parts of its hardiness zone range, but will die back to the ground in climates with winter temperatures below 10°F. A thick winter leaf mulch is recommend in colder climates. Cut back untidy foliage in late winter, before the flowers emerge.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Entry Paths (7)

PERENNIAL

Ast i lbe x arendsii ‘D eutschland’ Deutschland Asti lbe

An herbaceous perennial with plumes of snow white, feathery flowers. Thrives in organically rich, evenly moist, acidic, well-drained soil, sited in bright shade or filtered sun; does not tolerate dry conditions. Mulch to keep roots cool and moist, avoiding the crown. Spent blooms are to remain throughout the late summer and fall. Astilbes and their spent blooms are to be pruned back anytime after they’ve gone winter dormant. Feed in early spring, and again after bloom. Can be divided every 3-5 years in early spring. Cut through woody crowns to separate eyes to form additional plants. Add fertilizer or compost if desired when planting or moving and in late fall to winter. Astilbe ‘Deutschland’ has white flowerheads, promptly remove any Astilbe plant with another bloom color and replace with Astilbe ‘Deutschland’.

SPRING SUMMER FALL WINTER

MAINTENANCE

DESCRIPTION

Astilbe x arendsii ‘Deutschland’ (Deutschland Astilbe), with its white, feathery flowers and gentle mounding form, has foliage that reaches 1 ft. tall, 3 ft. wide; flowers reach 2 ft. tall. Plants are characterized by graceful, fern-like mounds of mostly basal, 2-3 ternately compound leaves, usually with sharply-toothed leaflets, and tiny flowers densely packed into erect to arching, plume-like flower panicles rising above the foliage on slender, upright stems, blooming May to June.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Berms (8)

PERENNIAL GRASS

C are x P e nnsylvania Pennsylvania Sedge

Carex Pennsylvania (broad-leaved oak sedge or Pennsylvania sedge), forms loose leafy tufts. Foliage is fine textured and bright green.

Blades are up to 12” long and about 1/8” wide. The narrow glossy leaves are semi-evergreen in moderately cold winter climates. Plants are monoecious (spikelets of male flowers above female flowers). Flowers bloom in late spring (May) in inflorescences atop rough, sharply triangular culms (stems) which rise up singly from the rhizomes.

SPRING SUMMER FALL WINTER

MAINTENANCE

DESCRIPTION

Carex Pennsylvania is a lovely but fairly common sedge of mesic or dry woods. Plants form large colonies from long strong rhizomes. In the wild, this sedge occurs in partial sun or shade in well drained or dry acidic woodlands. In landscape situations, moist soil is preferred but plants will tolerate average soils and some drought. Cut back groundcover in late winter at the same time as Pennisetum alopecuroides to promote new spring growth.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Entry Paths (7)

BULBS

L euco jum aestivum ‘G iant Snowdrop’ Giant Snowdrop

SPRING SUMMER FALL WINTER

Leucojum aestivum blooms in mid-spring (late April) not in summer. It blooms several weeks and goes dormant by summer. Dark grassy green leaves to 12” long and 1” wide form an upright, vase-shaped clump of foliage. Typically 2-5 (less frequently to 8) white, nodding, bell-shaped flowers appear at the top of naked hollow flower scapes (to 12-15” tall) in spring. Each flower has three similar looking sepals and petals that are spotted at the tip with green.

MAINTENANCE

DESCRIPTION

Easily grown in organically rich, medium moisture, well-drained soils in full sun to part shade. Adapts to clay soils. Plants need consistent moisture during the spring period of growth and bloom. After dormancy in summer, they will tolerate drier soils, but will appreciate a summer mulch which helps keep soils moist and cool. Plant bulbs 3-4” deep and 4-6” apart in fall. Bulbs are best left undisturbed once set in the ground. Plants will naturalize well by bulb offsets. Do not cut foliage back after bloom, rather let the leaves die back naturally.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Pershing Plaza (2), Upper Terrace (3), Lower Plaza (5), Entry Paths (7)

PERENNIAL

Lir i op e muscari ‘Mo nro e’s W hite’ Monroe’s White Li lytur f

SPRING SUMMER FALL WINTER

Liriope muscari, commonly called lilyturf or blue lily turf, is a tufted, tuberous-rooted, grass-like perennial which typically grows 12-18” tall and features clumps of strap-like, arching, glossy, dark green leaves (to 1” wide). Clumps slowly expand by short stolons, but do not spread aggressively. Erect, showy flower spikes with tiered whorls of dense, white flowers rise above the leaves in late summer. Flowers give way to blackish berries which often persist into winter.

MAINTENANCE

DESCRIPTION

Easily grown in average, medium moisture, well-drained soil in full sun to part shade. Tolerates a wide range of light conditions and soils. Will grow in close to full shade, but will produce more elongated foliage and spread more slowly. Also has good tolerance for heat, humidity and drought.

Foliage is evergreen in warm southern climates, but declines considerably in areas with cold winters. Cut foliage to the ground in late winter at same time as Pennisetum alopecuroides in preparation for new growth. Liriope ‘Monroe’s White’ has white flowerheads, promptly remove any Liriope plant with another bloom color and replace with Liriope ‘Monroe’s White’.

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Berms (8)

BULBS

P ap aver o rientale Oriental Poppy

SPRING SUMMER FALL WINTER

Papaver orientale, commonly called Oriental poppy, is among the most popular poppies available. They are clump-forming plants featuring flowers in shades of red. Serrate, thistle-like, grayish-green leaves (to 12” long) are pinnately dissected into lance-shaped segments and have a somewhat weedy appearance. Foliage yellows and dies shortly after flowering, typically leaving a hole in the garden. Basal mats of new leaves appear in fall and overwinter until spring when the foliage puts on a spurt of growth up until the point when the flowers bloom.

MAINTENANCE

DESCRIPTION

Best grown in organically rich, fertile, medium moisture, well-drained soils in full sun. Performs well as long as drainage is good. Mulch in winter until well established, but plants should otherwise be left undisturbed. Tends to self-seed, but self-seeded plants may not come true. Therefore, remove stems of spent flowers before seed forms in early summer. New growth begins in the fall when temperatures are cool and getting colder; new shoots sprout from the sleeping roots. Foliage unfurls until it forms a mound. This mound of green will stay there through the winter. In spring, the growth begins again and the clump sends up long stems of bright flowers. Oriental poppies are supposed to go dormant in midsummer.

Based on their growth habits, spring is the best time to plant oriental poppies where the winters are cold. Refer to Section 11 h ii of the Performance Work Statement regarding replanting of Papaver. 25% of original quantity to be replaced every two years to ensure longevity.

The 25% is to be spread out across all three berms on site, not concentrated within one area during each rejuvenation period.

*SEED PODS IN EARLY

SUMMER/LATE SPRING

NATIONAL WORLD WAR I MEMORIALLOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. IN VEL ANTEEGET EX COMMODO MALESUADA. SED SUSCIPIT DUI IN ODIO PELLENTESQUE, UTSCELERISQUE DUI PRETIUM. ALIQUAM HENDRERIT SAPIEN SIT AMET MAURISORNARE CURSUS.SCALE: 1" = 10'-0"NORTH:

PENNSYLVANIA AVENUE NW

14TH STREET

NW

15TH STREET NW

NORTH

N

Scale: 1" = 16'-0"

16' 32'

Planted in Zones: Lower Terrace (5)

PERENNIAL GRASS

P enni se tum alopecuro ides Fountain Grass

SPRING SUMMER FALL WINTER

Pennisetum alopecuroides, commonly called fountain grass, is a warm season ornamental grass which typically grows in graceful, spreading clumps from 2-3’ tall and as wide. Features narrow, medium to deep green leaves (to 1/2” wide) in summer, changing to golden yellow in fall and fading to beige in late fall. Foliage usually remains attractive throughout the winter. Showy, bristly, bottle brush-like flower spikes arch outward from the clump in late summer like water spraying from a fountain (hence the common name). Flower spikes turn brownish as the seeds form, and spikes usually persist until late fall or early winter.

MAINTENANCE

DESCRIPTION

Easily grown in average, medium to wet soils in full sun to part shade. Best in full sun. Tolerates part shade, but may not flower in too much shade.

Tolerant of drought once established. Cut foliage to the ground in late winter before new shoots appear.

ADDITIONAL MAINTENANCE DATA

Shredded leaf mulch

SPECIFICATION

MATERIAL REQUIREMENTS. Compost shall be the material resulting from the biological and biochemical decomposition of biosolids, source-separated organic waste, yard waste, leaves or agricultural waste. These composts shall have been commercially or municipally produced. Compost and composting facilities shall be in compliance with all federal laws (40 CFR Part 503 and others), Article 10 of the Agriculture and Markets Law and 6 NYCRR Part 360.

Biosolids, including mixed solid waste, septage and other sludges, are the solid or semi-solid organic material generated by a wastewater treatment plant. Source-separated organic waste (SSOW) is readily decomposable material that is separated at the point of waste generation, and may include, but not be limited to, food scraps, food processing residues, soiled and/or unrecyclable paper, and other compostable materials. Yard waste includes grass clippings, leaves and other similar readily-compostable organic material.

Compost shall be reasonably free of sticks, stones, refuse, materials deleterious to soil structure, or any material toxic or detrimental to plant germination and growth. Compost containing foreign material may be rejected on the basis of a visual examination.

Composted biosolids shall have a certificate from a laboratory approved by the NYSDOH verifying compliance with all applicable laws, rules, and regulations. Only facilities permitted to compost biosolids under 6 NYCRR Part 360 will be allowed to furnish biosolid compost. The certification shall be supplied by the Contractor prior to the delivery of any composted biosolids, topsoil containing composted biosolids, or other such regulated material to the contract site.

Leaf Compost. The material shall consist exclusively of deciduous leaf material. Compost material that contains food waste, sewage waste, or other waste material is unacceptable. The leaf compost shall be mature (actively composted for 6 months minimum, and temperature slightly above air temperature) and humic (organic material is no longer rapidly degrading). Mature compost material shall be a dark, friable, partially decomposed substance that has an earthy odor. Visible fibers should be short and dark with no discernible particles of leaf material. Because not all items decompose at the same rate screening may be necessary to remove larger partially decomposed material and/or undecomposed material.

Organic Content – 25% to 100% by dry weight Natural Inert Material - <5% by dry weight of woody or green yard debris material.

Man Made Inert Material - <1% by dry weight of man made material such as glass or plastic. Bulk Density – 636 to 812 kg/m3 Moisture Content – 30% to 60% by total weight

BASIS OF ACCEPTANCE. Compost will be accepted on the basis of a Producer’s label or a certificate of analysis by a laboratory certified by a nationally recognized entity indicating compliance with the material requirements and visual inspection.

Composted biosolids will be accepted on the basis of a material certification by a NYSDOH approved laboratory that the product conforms to this specification and all applicable regulations.

Compost supplied or manufactured by participants in the US Composting Council’s Seal of Testing Approval Program will be accepted on the basis of the Program’s Compost Technical Data Sheets. The data shall represent a minimum of one year of testing results and the most recent test shall have been conducted with ninety days of material acceptance.

Compost supplied or manufactured by suppliers that do not participate in the US Composting Council Seal of Testing Approval Program will be accepted on the basis of a material certification, by a laboratory certified by a nationally recognized entity, that the product conforms to this specification.

The Department reserves the right to sample and test the materials subsequent to delivery.

Gradation:

Maximum particle length; 6 inch

Sieve Size Percent Passing by Weight 1/2 Inch 100 No 16 0