NZ Gardener

Spend some time on your spuds.

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You will often be advised to mound up your growing potatoes with soil as the green tops grow to increase the production of edible tubers, but my friend, the late NZ Gardener writer Virgil Evetts once told me he just laid a deep layer of mulch over the top instead. Most organic matter would work, he said, but the most readily available option for most gardeners was lawn clippings. You just needed to cut the grass on a dry day (otherwise it can get slimy) and lay it all around your spuds about 10cm deep. The grass clippings act as a mulch, so help keep water in the soil, and as they break down they add organic matter to the soil. Plus the clippings heat up as they break down, so they help keep your heat-loving spuds warm undergroun­d. Don’t pile the mulch up much thicker than 10cm though or it can remain too wet which can cause problems with mould or decay. If you have any extra bags of leaf mould you laid down in autumn, mix the leaf mould 2:1 with dry grass clippings and use that as a mulch around other edible crops. You can also add grass clippings to your compost, they are an excellent source of nitrogen. But you need to make sure you add plenty of carbon-rich material at the same time otherwise the grass clippings will start to break down anaerobica­lly, which means they will be slimy and smelly. Carbon-rich material can be harder to find in spring when everything is green and growing, so throw in scrunched up sheets of newspaper, torn pieces of cardboard, or shredded paper.

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