The answer is a phenomenon known as etiolation. The stems elongate more rapidly in their search for light; the stem is thinner and more pale in comparison to healthy grass due to the lack of chlorophyll. 
Would you like the grass in your lawn to look lush & green? Our network of Lawncare specialist companies can help.
The UK Lawn Care Association (UKLCA) is an organisation based in the United Kingdom committed to helping garden owners across the country find independent lawn care specialists to provide care for their lawns.
© 2009-2019 – The UK Lawn Care Association