From 1 April the partnership will extend from England across the UK with plans for it to combine the views of different disciplines and become a vital voice for green infrastructure. There is no Government funding.
Announcing the takeover at the AIPH International Green City Conference, TCPA projects head Julia Thrift said: "The value of green infrastructure has been increasingly recognised. It's not just about biodiversity, it's not just about people, it's not just about transport, play or sport - it's about all these things. We thought it would be extremely sad if the partnership fizzled out."
She called for small pledges from organisations and said the role of planning is vital in creating high-quality green-infrastructure models. The Landscape Institute has already signed up.
The conference brought together international speakers from planning, ecology and health to discuss the benefits of green infrastructure.
But delegates raised questions about how to translate the vision into reality. China Flower Association deputy secretary general Peng Hongming said: "Without Government support there's no way you can have sustainable growth or development."
See Full report, Horticulture Week 18 April.