The installation, As above, So Below can currently be seen at Siobhan Davies Studios in south London and Dunnett and Lobb will investigate ideas it raises about growing plants indoors, ecosystems and creative design approaches to sustainability.
The event will be introduced by Darryl Moore, director of Cityscapes which organised both the installation and the event.
Dunnett is professor of planting design and vegetation technology, and director of the Green Roof Centre at The University of Sheffield. He was lead horticultural consultant for the London 2012 Olympic Park alongside Sheffield University colleague Professor James Hitchmough.
Lobb, who started his career as an artist, also lectures on the arts and is a sculptor alongside his garden design work. He was the winner of a gold medal, and the Best Conceptual Garden award at RHS Hampton Court Palace Flower Show in 2011 for his underground fungal garden Landscape Obscured.
Last year he created the fourth garden installation in Cityscapes Remix Garden project at Oxo Tower Wharf in October 2013, which took a RHS Chelsea show garden and "remixed" the contents, with designs by different designers.
As Above, So Below features a water cycle which draws moisture from the air to maintain a series of copper planters suspended within the airspace of the building’s atrium and planted with ferns, mosses, lichen and toadflax.
The plants are fed by water collected by a dehumidifier on the first floor via a series of rills, with the excess travelling down to a collection bowl at ground level, from which it evaporates, creating a feedback cycle.