Johnsons parent company DLF Trifolium consumer sales manager Guy Jenkins says consumers deserve quality, and lawn seed should not be exempt from this.
He added: "Some suppliers however are taking advantage of pricing sensitivities and the fact that many consumers do not necessarily understand the differences between lawn seed types and their characteristics.
"As a result we have heard of several cases of agricultural grasses, including annual ryegrass, being used in domestic blends. This will not only result in poor quality lawn but can lead to long-term lack of consumer confidence in lawn seed products. There is no doubt that this can have a negative impact on all suppliers, no matter the quality they offer."
He said: "As we look ahead to the 2015 season we are calling for all suppliers to consider the long-term impact that bulking out lawn seed mixes with low grade seed can have on the long-term success of their business, as well as the wider market.
"It is our responsibility to ensure the future of our industry, and will be doing everything in our power to ensure that our offering is consistent and of the highest possible quality both now and into the future."