Landscapers will be at the forefront of creating environments that will thrive in the changing conditions, said Writtle College senior lecturer in landscape management Mick Lavelle.
He said: "Climate change is happening but we are all too obsessed with working out who is to blame and meeting targets.
"The simple fact is that the climate is already changing and as a landscaper you may think it is fine to bung something in the ground and hand over, but if the plants don't grow that is your problem."
The higher temperatures predicted by climate-change scientists will have an impact on the types of plants seen in the British garden. Lavelle said: "Some of the stalwarts of British horticulture and the landscape may need to be replaced.
"We need to think about what the gardens of the future will be like. The science is the important part of this.
"There is a danger we will run out of plants purely through our own inactivity and failure to face up to what is happening."