Some 17% of gardeners surveyed said garden care chemicals are the only successful solution to manage weeds.
Some 41% said they needed a faster impact than they get with organics.
A fifth of respondents said they did not have time to weed their lawn by hand, and 31% of people said they found weeding their driveways by hand too difficult.
Group chair Gary Philpotts said: "Our findings reinforce an industry-held ideal: that gardeners need to have a wide spread of options to help them tackle their daily weed regrowth issues."
For 14% of gardeners, the cost garden care products is not important if it solves the problem.
The Common Sense Gardening Group is an alliance of five companies involved in garden care products: Doff, SBM, Evergreen, Vitax and Westland.
This week, a US court has ordered that chemical company Monsanto has to pay $289m (£226m) damages to a man who claimed herbicides containing glyphosate had caused his cancer.
The Group said: "With over 40 years of safe and effective use, glyphosate provides millions of garden owners worldwide with an efficient and time-saving solution to weed problems."