Over the years, I’ve done a lot of research into asking whether we need to be using topsoil.
These are some questions that we need to ponder upon as we reconsider the traditional gardening norms. It is our responsibility to explore and understand the alternatives, and perhaps even discover new, more sustainable methods for creating the gardens of our dreams. How can we innovate and still achieve stunning, flourishing gardens without it?
Is it truly necessary in our gardens? Are there alternative solutions that we could explore instead of relying on traditional topsoil?
I’ve looked at alternatives to using topsoil and which substrates are best for planting, especially in our climate and considering ongoing climate change. Buying large amounts of topsoil for garden design is not sustainable or environmentally friendly
Many garden designers at high profile shows such as RHS Chelsea have used recycled waste materials in their gardens to showcase how sustainable gardening can be both beautiful and flourishing.
Using gravel and rubble based soil allows for hardy and drought resistant plants to flourish.
It sounds illogical but using waste and rubble for a base can create the most beautiful drought-tolerant and ecologically diverse gardens. Growing in sand or rubble can massively reduce the number of weeds we have to deal with, compared to nutrient rich fertilised soil.
Examples of substrate could include broken bricks, rubble, sand and aggregate. This type of garden would suit plants from a Mediterranean climate, which require fast-draining soil.
What are the benefits to growing plants in substrate over topsoil?
- Plants will grow slower and require less attention
- They can survive with less water and will be drought tolerant
- There will be less competition from weeds
Here are some examples of plants that would flourish in recycled substrate.
Verbascum phoeniceum
This tall flowering mullein has lots of small purple flowers, which sway in the breeze. This plants looks great in a mixed border.
Eryngium pandanifolium
This seaholly is a tall plant with architectural structure and purple flowers.
Caryopteris
This is a small deciduous shrub with colourful blooms in late summer and autumn, with flower colours ranging from white and baby pink through to all shades of blue.
Stipa tenuissima
This clump-forming Mexican feathergrass is a brilliant drought tolerant grass, providing structure to any garden design.
Salvia Nemorosa ‘Caradonna’
This gorgeous violet purple hardy perennial is really drought tolerant and looks stunning in any garden.
