Ross ClarkJim Warner


BSc (Forestry)
Director, Trees Impact Pty Ltd

Since graduating in Forestry, Ross has worked continuously in the production and improvement of landscape trees. He is now a leading consultant, adviser and industry spokesperson for improved tree quality and specifications, frequently conducts clinics, addresses seminars for industry groups and lectures at educational institutions. His created the "NATSPEC" specification for trees (published by Construction Information Systems P/L in 1996 and revised in 2003) which became accepted as the industry's strictest standard and has now evolved into the official Australian Standard 2303:2018.

The involvement of someone of his qualifications and stature, to link the grower and tree users, is not to be found anywhere else in our industry.

Jim WarnerJim Warner

Director, Trees Impact Pty Ltd
Managing Partner, Karignan Plantation

Jim manages group production through Karignan Plantation and its support growers. He has 40+ years of professional and small business experience. Jim and wife Sylvia established Karignan Plantation in 1993 and, with technical and marketing support from Ross Clark, have developed that nursery, and its network of support growers, into the multi-skilled group that is the production arm of the Trees Impact Group.

Richard Reilly

Quality Manager/Environment Manager
Advanced Diploma in Horticulture
Advanced Diploma in Environmental Management

Richard has been with us for  well over 20 years. He served as our Production Manager for many years and is now Quality Manager and Environmental Manager.

Lisa Murdoch

Operations Manager
Advanced Diploma in Horticulture

Lisa too has been with us for more than 20 years and now manages stock control, all freight arrangements and much of our customer relations along with many other aspects of our operations

Simon Smith

Production/Resources Manager
Certificate III Horticulture

Simon has been with us for more than 10 years and now manages all site and operational resources as well as managing all preparation and loading for shipment of trees.

Jake Pike

Production and Contracts Manager

Jake has been with us for two years after 11 years in senior roles at another major production nursery.

Root Pruning Large Spotted Gums

Root Pruning Large Spotted Gums