The briefing, which included RHS, HTA, Royal Parks, City of London and British Association of Landscape Industries representatives, tackled the code of practice on water restrictions that failed to make it into legislation earlier this year, plant health, research, urban planting and apprenticeships.
APPGHG chairman Baroness Fookes said the secretary of state "took on board our various points" and was "anxious to co-operate".
HTA business development director Tim Briercliffe said he particularly welcomed her appreciation of the decline in urban planting highlighted in the HTA's Greening the UK campaign. He said: "She recognised and agreed that we are seeing a reduction in planting in urban areas and felt we should work hard to influence the whole planning reform process."
City of London director of open spaces Sue Ireland agreed: "She was very keen on the importance of open space in new developments and that green spaces are sustainable and saw the planning regulations as a real opportunity to ensure that happens."
A paper submitted to the meeting called on the Government to enshrine planting provisions within the new national planning framework and to incorporate the need for quality landscape planting within any revision of the Code for Sustainable Homes.