This document provides a site plan and planting schemes for a project that includes three roundabouts with large Baobab trees and flowering plants. It outlines different options for plantings in the roundabouts and road medians that are drought tolerant and support clear lines of sight. Architectural structures are also proposed to be covered in bougainvillea for the forecourt area.

1. 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 KEY
Landscape 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

2. CARRIAGEWAY CROSS-SECTIONS:
CARRIAGEWAY
MARGIN
CARRIAGEWAY
CENTRAL
MEDIAN
CARRIAGEWAY
MARGIN

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

4. 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

5. 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

6. 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
ROUNDABOUTS
DETAIL 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
NOTE
The soil will
be covered
with
compost and
bark chips
for final
appearance
and water
conservation
1 x Adansonia
digitata in
centre of
roundabout

7. ROUNDABOUT CROSSINGS: Option 2
OPTION 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

8. Carriageway Median Strips:
Rusellia
equisetiformis to 1m
height (centre) and
Dianella to 50cm
height (border)
Delonix regia
To 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

9. 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

10. Plantings along the carriageway median strips
under & between Delonix regia trees:
Rusellia equisetiformis Dianella intermedia ‘Variegata’

11. Carriageway margins: tropical hedge planting
Cross-
section
A-A
Cross-
section
A-A
naemontana
m height) and
llamanda
m height)
mbination
Hamelia (1.8
height) and
Ixora (1 m
height)
combination
Planting schemes A and B
alternates on each side of
the road
Design A Design B

12. 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
NOTE
The soil will be
covered with
compost and bark
chips for final
appearance and
water
conservation
Planted at 1m spacing
Planted at 2m spacing

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

14. Forecourt Promenade:
ARRIVAL &
DEPARTURE
PROMENADE
PLAN & SCHEMATIC
VIEWS

15. 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

16. 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