Posted: 15/09/2015 at 16:40
Nice wall Tetley
Sheila, I would go for a minimum 60 cm gap but 90 cm will give you so much more scope.
All the cascading stuff like aubretia,,helianthemum, arabis,,etc. if you have a reasonable amount of sun comvolvulous cneorum is lovely. Also one I grow called comvulvulous maritima.....hanging velvety purple flowers all summer long. You could throw a fleece over it in winter. Osteospermums too...take cuttings to provide replacements. Thyme like Silver Posie which is a taller as well as spreading variety with silver/grey foliage and pink flowers. Prostrate rosemary...go to a specialist for best blue ones. Nepeta too for blue. Hypericum polyphyllum is an evergreen small...about 25 cm....upright plant with dainty yellow flowers. How about perennial wallflowers? Gauras? Some gentians? Pinks...the cheddar mound forming ones too? Armerias...there are white flowered varieties too? Anemone blanda for spring? Pop aeoniums there in late spring. Grasses like festuca and stipa tennuissima. Silver plants like artemisia powys castle and santolinas. Penstemons would prob grow there too As well as sedums. And veronicas.....blue,,pinky red and white. Campanulas. Some of fhe smaller phormiums like Dazzler. a plant I like very much is anisdontea.......delightful shrubby reddish flowers.
Some of the smaller hebes, pittosporum tom thumb, eryngiums, heucheras, too. Comsider a variegated iris....pallida variegated. Lovely blue/white clean foliage and it flowers too. For similar spikey but evergreen foliage check out libertias...some lovely olive/ orange/copper leaf colours
oops! Better give someone else a go!