Here's a few suggestions to get you started. Let me know if I'm on
the right track.
"On the hot south facing wall the deep purple flowered Clematis 'Black
Prince', Actinidia pilosula with its pointed, deep green leaves that
look like the tips have been dipped in white paint and Thunbergia
aurea make great use of the microclimate and hot setting during the
summer while further Clematis can be seen growing on the other walls."
"...foot of the peach and apricot trees against the south wall are
clumps of Iris stylosa. This lovely mauve flower, looking like, a
Cattleya orchid, is very capricious. In some soils it takes six years
before it flowers, while in a hard, gritty border with chalk and
mortar rubble, and growing in among the roots of everlasting peas and
roses, it flowers in quantity from December to March. Belladonna
lilies are also at the foot of the wall. They want a richer soil and
plenty of sun, and take time to establish before flowering."
Penstemon barbatus 'Coccineus' Beard's Tongue, Scarlet Zone:
3-9 Sun, Lt. Shade
Sharkshead penstemon are fairly long-lived, and the 'turtlehead-like'
flowers are striking in the garden or as a cut flower. Not as fussy
about drainage as most. Will take very hot spots, like a south-facing
wall. Plant it in well- drained soil, and wait not long for the
Pulmonaria 'Trevi Fountain' PP1304 Lungwort Zone 4-9 PS
"Superb, brightly silver-spotted long leaves give rise to profuse
clusters of large cobalt-blue flowers in spring. A stunner! Inspired
by a fountain in Roma. Partial shade - morning sun ok. We feel it is
our best, true dark-blue. The roots of this plant are in P.
longifolia, the best form for the south," Terra Nova.
"...live in Oakland California (U.S.) on a hot southwest facing slope.
My Night-Blooming Jasmine was planted in front of a hot wall in a
raised bed and with considerable smog from a busy street only a few
feet away. It survived several years with no water before I moved in.
I think it is much tougher than it is given credit for. We don't get
hard freezes though. It has even reacted negatively to regular water,
but it is established. This is one of my new favorites."
"Well, I planted my 2.5 foot tall Night Jasmine outside on the south
wall of the house where it flourished and bloomed profusely last
summer. It grew to nearly five foot. In autumn I mulched it heavily
(about 8 inches) and hoped for the best. I also took 6 cuttings (for
inside)and they rooted with ease. The entire plant died all the way
down to the ground (we had one of our worst winters ever last year)
but it came back in mid-June. I also planted the cuttings around it
this summer and the entire clump is now about 2 feet tall, but it has
not bloomed yet."