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, and - in extreme situations - lead to erosion. In the wild, plants quickly colonise exposed earth, protecting its structure and absorbing the nutrients that would otherwise be washed away. A green manure does the same thing; you just have control over what grows

of goodness). My favourite plant at this time of year is a magnificent Parthenocissus that covers an old building nearby.I like to go there every few days to watch the leaves change from deep green to pink and yellow and deep dark red. It is a truly

I've always been fascinated by algae. These simple organisms take so many forms. Some are accurate indicators of water pollution, and some, like the blue-green alga spirulina, are a brilliant source of vitamin B12. But right now they've gone too far

. Silty soil is smooth to the touch. It rolls into a ball easily, but won't keep its shape as well as clay soil.Silty soilAdvice on preparing and improving soilImproving soil with green manureMaking a soil sievePreparing the soil blog