The students were praised for their academic and professional achievements by RHS director general, Sue Biggs.
"These are very talented individuals," she said. "The RHS is committed to helping people expand their skills and embrace their love of horticulture in all its branches."
The Master of Horticulture Award - the most prestigious professional qualification the RHS bestows - went to four students.
Amy Cook from Somerset, Mercy Morris from West Sussex, Martin Perry from Hampshire and Janice Raven from Essex showed a high standard of horticultural knowledge, experience, practical competence and proficiency, said the RHS.
Katie Price and Lucy Hart meanwhile were jointly awarded the Bursaries Advisory Committee Prize for a report on their tour of the Appalachian Mountains and the Piedmont and coastal plains of North Carolina.
They studied native flora and identified several species with horticultural promise, and which could potentially be introduced into UK cultivation.
Guy Moore won praise for gaining the most on a personal level after help from the RHS Coke Trust Bursary funded a field trip to the Caucasus.
Sarah Morley won the Centenary Prize for highest achievement in the RHS level 2 certificate in horticulture, studied at Brooksby Melton College.
Christine Hammond won the Anne Menhinick Prize for highest achievement in the RHS level 2 in horticulture for someone aged under 30.
The Hector Harrison Award went to Ginny Malmgren for scoring highest marks in exams for the RHS level 3 advanced certificate in Horticulture.
Bill Warrell received the Chittenden Award for gaining the highest overall mark in the RHS level 3 Diploma in Horticulture.