The two organisations hope to work together to promote gardening and horticulture in the future, and further discussions will take place in the coming months on issues such as peat use, environmental issues and joint promotional opportunities through campaigns such as Britain in Bloom and Greening the UK.
HTA director general David Gwyther commented: "There has, of course, always been a close alignment of interests between the RHS as the UK’s leading gardening charity and the HTA as the trade association of the garden industry."
On the meeting, he said: "The meeting recognised the excellent work our two organisations have co-operated on in the past while recognising that there is more that we can do together, to, for example, protect and promote horticultural science, build the profile of gardening and horticulture as a career choice and engage more consumers with the pleasures of gardening.
"The HTA looks forward to working with Sue Biggs and her team at the RHS to realise our shared ambition for the sector."
The two organisations hope to build on the success of their previous partnerships such as their co-sponsorship of the All-Party Parliamentary Gardening and Horticulture Group and the joint publication of the RHS/HTA Easy Guide series of consumer advisory leaflets.