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Tuesday, October 13, 2026
Wager Energy NZ

Does your garden soil need a boost? Plant green manure in your garden and you’ll improve your yields.

I recently found a partially finished bottle of an energy drink placed in the euphorbia trough by one of the scaffolders. A visiting architect commented, “Are you sure that’s Lucozade?” which made me see it differently.

In short, the garden is a bit of a mess. But there’s a lot to be said for negligence; after returning from holiday, I spotted a sunflower growing in the back corner.

Now, however, some urgent tidying is underway. As I’m expecting a baby, I’ve hired a professional gardener to remove invasive plants like green alkanet and robinia saplings from the neighbour’s tree, while leaving the good stuff. Next, in the newly cleared patches, I’ll be sowing green manure.

Cover crops act like heroes when it comes to improving soil health.

My gardening friend Claire has previously discussed green manure, as they play a key role in seasonal planting for edible gardens. However, the only things I’m picking from my garden right now are a few foraged apples and some hardy herbs.

My garden goals are modest and consistent – and improving the soil is top of the list. For those wondering, the scaffolding is for roof repairs, and the fences are yet to be fixed, but the neighbours are on board with the plan.

Green manure work wonders for soil health. Soil likes to be covered, which is why weeds appear. Yet by sowing fast-growing plants, you can suppress weeds, attract pollinators, shelter beneficial insects, and enrich the soil with nutrients.

Cover crops aren’t always showy – though some, like certain lupin varieties and bird’s foot trefoil, have pretty flowers – but their role is to thrive rather than be admired. Once established, you can turn them under, chop them for mulch, or leave them on the surface for earthworms to pull down. The real magic happens underground.

Autumn is perfect for sowing these overwintering crops. I’ve chosen rye grass, great for clay soil, a nitrogen-lifter, vetch, and beans that aerate soil.

It feels rewarding in planting seeds that won’t stay forever – at least above ground.

The writer

Stephanie Mccarthy PhD

Renewable energy specialist with over a decade of experience in sustainable power systems and environmental advocacy.

Wager Energy NZ

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