The Young Landscape Contractor competition was supported by BALI and began in 2016. The event saw three pairs of young landscapers build a garden at the show as the RHS aimed to find "the best emerging talent" in the industry.
BALI said: "The Young Landscape Contractor element of RHS Flower Show Tatton Park will not be proceeding due to the removal of funding from the competition by the RHS. BALI is incredibly disappointed with the decision that the RHS has taken."
The RHS has replied: "The RHS and Sue Biggs care very much about promoting and recognising the skills of landscapers, which is why the RHS introduced the Young Landscaper Competition at RHS Flower Show Tatton Park two years ago.
"However, recently the Young Landscaper Competition has struggled to attract applicants due to young landscapers being unable to be released from work or their own in-house training programmes.
"Therefore we have been discussing with BALI other ways that we can better support and promote Young Landscapers at our RHS Flower Show Tatton Park. We will be announcing our new plans to promote Young Landscapers at the show early next year."