I had a look to this link lauribob provided.
https://gardenresearch.com/ It took me to a page for National Gardening Survey 2018 Edition for $ $1,295.00. Is this the data that members contribute here for sale?
https://gardenresearch.com/abo...
Garden Research, a division of the National Gardening Association, is a well-known and widely recognized authority on the U.S. consumer lawn and garden market.
Since 1973, we have worked with the Gallup Organization, Harris Interactive, and now Research Now/SSI to provide market research information for the lawn, garden, and nursery industries.
Our market research reports and research services have helped companies identify and define marketing opportunities. Our reports and services also help companies improve their advertising, sales presentations, brand awareness, positioning, product development, strategic planning, customer satisfaction, investor relations, mail order catalogs, websites, and more.