Zoysiagrass – Late to Green Up
Q: Why is zoysiagrass so late to green up each year? Our lawn looks like it isn’t coming in well.
A: Yes – in some years zoysiagrass won’t be completely green until June. It might be caused by several things:
• Scalping too early (soil temps need to be 60 degrees and steadily rising)
• Applying Nitrogen too early (soil temps need to be 65 degrees or higher)
• Thatch layer is too thick, preventing soil warm-up
• Large Patch disease. See Large Patch on Zoysiagrass
• Previous year misapplications of fertilizer or herbicides
• Irregular weather patterns (very cold in mid December, warm enough in January to start breaking dormancy followed by more cold, then a late frost in 3rd week of April)
• There are also genetic off-types of ‘Emerald’ Zoysia being sold. ‘BK-7’ zoysiagrass looks like ‘Emerald’ but does not green up like ‘Emerald’ zoysiagrass.
This paper by Dr. Clint Waltz explains it:
‘Emerald’ Zoysiagrass: Genetic Techniques Explain Common Observation
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