Three roundabouts with large Baobab trees and feature

gardens of Tecoma, Oleander and

Hibiscus

PROJECT SITE PLAN

Roadway margins or side strips planted

with Ixora, Hamelia, Tabernaemontana,

Allamanda

Roadway median strips planted with Delonix regia trees

and Dianella ground cover

Open area with native trees in a meadow planting

with Bermuda grass

COLOUR KEYLandscape elements

Forecourt and esplanade -

Palms or architectural Bougainvillea-clad

‘’trees’’

These plantings must be like thick hedges to

stop pedestrian movement

These plantings must be like thick hedges to

stop pedestrian movement

These plantings

must be like thick

hedges to stop

pedestrian movement

CROSS-SECTION E-E

CROSS-SECTION A-A

CROSS-SECTION F-F

CARRIAGEWAY CROSS-SECTIONS:CARRIAGEWAY

MARGINCARRIAGEWAY

CENTRAL MEDIAN

CARRIAGEWAY MARGIN

TREES: the Baobab tree (Adansonia digitata) for roundabouts and the spectacular Flamboyant (Delonix regia) for roadway median strips:

Understorey plants for roundabout feature gardens under Baobab trees for the three roundabouts:

Tecoma stans Oleander sp hybrids Hibiscus rosa-sinensis hybrids

Duranta repens ‘Gold’

Calotropis gigantea

ROUNDABOUT CROSSINGS: Option 1

Approximate roof profile

depths

Approx. 2m spacing

Approx. 3m spacing

Approx. 1.5m

spacing

Approx. 0.5m

spacing

Mulch to 150mm depth

Overall height >

6m when planted

Overall height <

2.2m when

mature

WARNING:IF CLEAR LINE OF SIGHT ACROSS

ROUNDABOUT IS REQUIRED UNDERSTOREY PLANTS WOULD BE

OMITTED (See OPTION 2)

OPTION 1: TROPICAL PLANTS

SECTIONAL VIEW

ROADWAY

8 x Nerium oleander used in the next ring of

plants interspaced and in front of the

Tecoma

6 x Tecoma stans planted

around base of Baobab

160 x Duranta repens gold used as edging plant

around the roundabout perimeter

120 x Crown Flower plant Calotropis, with its gold and green leaves and shade tolerance

used as a flowering and foliage ‘’filler’’.

Grows to 3m height when pruned. Flowers

profusely all-year round. Drought tolerant.

Large baobab (approx.10m)

trees are readily moved and replanted

Oleander is a strong vigorous plant that is

drought tolerant and hardy. It flowers all-year round and can be pruned to

height to accompany the Tecoma.

60 x red Hibiscus

interplanted with Calotropis

ROUNDABOUTSDETAIL OF PLANTING

SCHEME

It occurs naturally in Tanzania and is drought tolerant

Hibiscus is dry-tolerant and needs only pruning

and limited water to flower throughout the year

Fast-growing and hedges well with

bright foliage

NOTEThe soil will be covered with compost and bark chips for

final appearance and water

conservation

1 x Adansonia digitata in centre of

roundabout

ROUNDABOUT CROSSINGS: Option 2OPTION 2: SAVANNAH

PLANTS

SECTIONAL VIEW

The advantages of this planting scheme are: shape, colour, ease of

maintenance and clear line of sight

across roundabout

Hybrid aloes in

mass planting

Tabernaemontana (1.8m height) and

Allamanda (1m height)combination

Hamelia (1.8m height) and Ixora

(1 m height) combination

Mulch

Carriageway Median Strips:Rusellia

equisetiformis to 1m height (centre) and Dianella to 50cm height (border)

Delonix regiaTo maximum

height of 6-7m Roadway: vehicles illustrate

scale

Plant roots to be restricted by

growing bags or concrete ‘’box’’

Grass cover all areas not cultivated to plants

in median strips

Mulch

The planting scheme is easy to maintain and

control, as Delonix are easy to prune and best managed

by annual branch doctoring; Rusellia can be cut back to ground level to

rejuvenate as required; Dianella can be thinned

All plants are dry-tolerant

and flower well

2020 m

Roadway surface

Roadway surface

Rusellia is a fast-growing succulent

that flowers throughout the year and very hardy and

dry-tolerant

Rusellia equisetiformis in

a centre row along the island

Dianella intermedia planted with the

Rusellia along the outer margins

ROADWAY MEDIANS:PLANTING SCHEME

Dianella is a grass-like plant that grows by

clumping and is extremely hardy and dry-tolerant and

is very attractive when used with Rusellia

Delonix regia for

centreline planting at

25m intervals

Plantings along the carriageway median strips under & between Delonix regia trees:

Rusellia equisetiformis Dianella intermedia ‘Variegata’

Carriageway margins: tropical hedge planting

Cross-section

A-A

Cross-section

A-A

Tabernaemontana (1.8m height) and

Allamanda (1m height)combination

Hamelia (1.8m height) and Ixora (1 m

height) combination

Planting schemes A and B alternates on each side of

the road

Design A Design B

Road pavement

Hamelia shrubs alternataing with the Tabarnaemontana Tabernaemontana

and Hamelia planted at the back of the

hedges along sides of roads

Allamanda interplanted with

Ixora along front of roadways

Ixora alternating with Allamanda in

front of hedge

All garden shrubs like these require regular pruning

after short and long rains. Pruning thickens shrubs and improves flowering

ROADWAY PERIMETERS PLANTING SCHEME

NOTEThe soil will be covered with

compost and bark chips for final

appearance and water conservation

Planted at 1m spacing

Planted at 2m spacing

Plants for carriageway margins/side strips (left and right sides of approach roads):Allamanda cathartica Ixora javanica Hamelia patens Tabernaemontana

divaricata

Forecourt Promenade:

ARRIVAL & DEPARTURE

PROMENADE

PLAN & SCHEMATIC VIEWS

Dramatic architectural ‘’tree’’ stands proposed for the forecourt and esplanade:

Bougainvillea brasiliensis ‘Raspberry Ice’ for planting on the structures:

Every tree stand will have a different variety of bougainvillea or species of

climber providing a spectacular range of forms and colours throughout the year

Esplanade Forecourt bougainvillea stands:

Overall height 6m + 1.5m

Anchor bolts

Individual arms

bolted at neck

Structure design leaves

interior hollow

for plants

ELEVATION SECTION

Span 7m Span 7m

Braces and support for

foliage

All plant support

elements pre-fabricated &

bolted on site

Soil-filled planting

box

Plant climbing

rings every

1m

Climbers are fast-growing and will colonise these

structures rapidly

Constructed in stainless steel or galvanised

steel

DESIGN ELEMENTS