The plants include Spathiphyllum (Peace lily), Stromanthe, Chlorophytum, Ficus bonsai, Beaucarnia bonsai and Alocasia.
Members will consider which plant gives the best value for money in the office.
eFIG chairman Thomas Palreyman said: "By ‘value for money' we mean does the best job on a number of levels. One that is easy to maintain and tolerant to a number of locations and is favoured by office managers and health and safety officers.
"But of course with the new research by Margaret Burchett and her team at the University of Technology in Sydney, we know that all plants interact with the bacteria living in their growing medium to make the air indoor cleaner for us. As this can be up to 10 times dirtier than the air outside, this can only be a very good thing.
"Just one plant can make the difference. We used a number of recognised psychiatric test methods to discover that moods and wellbeing were considerably higher when people were working with plants in their offices. The mood ‘swingometer’ showed an improvement of up to 60% in the planted rooms."
Occupants of the rooms with no plants showed a tendency to increase their stress levels by 20 per cent.
eFIG members will nominate their best office plants and the top scorers will be judged by an independent panel of judges including Matthew Appleby of Horticulture Week and Adam Pasco of BBC Gardeners' World Magazine at the end of July.
Efig members will chose from this list of plants:
1. Spathiphyllum (Peace lily)
3. Codiaeum (Croton)
4. Ficus Bonsai
6. Beaucarnea Bonsai
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