After winning the title at RHS Harlow Carr, Moss will travel to Madagascar on the £2,000 Percy Thrower Travel Bursary sponsored by the Shropshire Horticultural Society.
The 28-year-old gardener at the floral section at Wisley studied at the RHS garden before starting work there in August 2010. She said she wanted to explore Madagascar's wet and tropical regions but had ambitions to go into horticultural product design.
"There is a gap for things that are functional and stylish for gardens that help plants grow and look beautiful. Winter protection looks like a blot on the garden and I could improve that," said Moss.
Second place went to Christopher Parsons (East Durham & Houghall College). Other finalists were Paul Traynor (Teagasc College of Amenity Horticulture), Chris Lockwood (Reaseheath College), Katie Croft (Threave Gardens), Michael Gregory (Sparsholt College) and Douglas Mackey (Pershore College).
MorePeople and the Horticultural Development Company were two of the competition's sponsors.