Hervey-Brookes won best in show at Tatton Park this week for his Perennial Garden, sponsored by Glendale and built by GK Wilson Gardening and Landscape Services.
Overseas shows are burgeoning and he plans to show at the Gardening World Cup in Japan in September and Melbourne and Singapore shows in 2016.
Hervey-Brookes said: "I really like international shows. The designers have a different cultural identity. I love doing them but doing well at RHS shows gives more weight because the judging criteria is stricter and you're with your peers."
Glendale staff worked on the garden, while Coblands provided plants and Barcham the trees.
Hervey-Brookes also mentored the young designer of the year competition at Tatton, won by Tamara Bridge and will mentor again in 2016.