Posted: 28/09/2013 at 20:07
Hello Martin. Welcome to the forum
I would not use soil in this way.
Have you thought of usImg plants to offer a perceived increase in garden height? There are loads of plants providing different effects. I like using spikes of plants offset with mounds and features. Right now I have cannas with purple foliage, green and white foliage etc carrying spires 6' or more of red, orange and yellow flowers providing an exotic look. Grasses .....stipa gigantea, for example, grows to 7' tall with swaying golden oat flowers all summer.......will give you height and movement. In a narrow lomg garden you could "meander" tall, see through plants like these from your patio to the bottom of your garden. Having tall focal points to emphasize width creates an illusion of a wider garden suggesting additional "gems" emticing you to investigate. So a meanderimg pathway. Evergreen mounds on strategic corners, fantastic summer, winter, spring and autumn perennials and other foliage plants will give you a fantastic outlook from your patio. Spend your money on working with what you have and not on raising your soil level which brings its own problems too.