Restoring Your Lawn After Winter
As winter comes to an end, your lawn might look worse for wear. Here’s how to revive it and prepare for a lush spring.
Dealing with Winter Desiccation
Winter desiccation, also known as "winter kill," occurs when turf loses moisture faster than it can replenish it, especially in freezing temperatures. This condition can cause the grass to turn yellow and die, affecting both the leaves and, in extreme cases, the roots and crown. All turf types are vulnerable, so it's crucial to care for your lawn during cold weather.
Managing Frost Effects
In Australia, frost damage is a common issue during the colder months. It happens when the grass surface temperature drops below the air temperature on cold, clear nights. Frost can cause temporary discolouration of the grass blades but usually does not result in permanent damage. Warm-season grasses are particularly at risk, though cool-season varieties can also be affected. To reduce frost damage, avoid walking on frosted grass, irrigate to melt the frost, or apply a turf colourant like ColourGuard.
Understanding Crown Hydration
Crown hydration is a significant cause of winter kill, occurring when turf absorbs moisture during warmer spells, followed by a sudden freeze. This can lead to ice forming on the crown, damaging or killing the plant. This issue is more likely in heavy, moisture-holding soils compared to well-draining sandy soils.
Identifying and Treating Snow Mould
Snow mould is a rare problem in Australia but can occur when snow sits on unfrozen ground for a long time. It causes circular patches in lawns, ranging from a few centimetres to 30 centimetres in diameter. There are two types: grey snow mould, which affects only the leaves, and pink snow mould, which can damage the crown and roots.
Lawn Recovery Techniques
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Returfing and Reseeding: For severe winter damage, returfing in spring is the best option. This process involves removing dead grass, preparing the soil, and laying new turf. Reseeding can be done during cooler months with cool-season turf varieties, following similar preparation steps.
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Fertilisation: Applying a nitrogen-rich fertiliser after winter helps restore essential nutrients lost during the cold months. This promotes healthy growth and repairs winter damage.
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Dethatching: Removing thatch in spring encourages new growth and clears out dead material. Use a scarifying machine or adjust your mower to a lower height to scalp the lawn. For rhizomatous varieties like couch, kikuyu, or zoysia, scalp close to the ground. For buffalo lawns, leave some runners visible.
By following these guidelines, you can rejuvenate your lawn and enjoy a vibrant, green space throughout the warmer seasons.
