The nursery will supply the following garden designers for their main avenue gardens: Ulf Nordfjell, Robert Myers, Nigel Dunnett, Chris Beardshaw and Jinny Blom.
The Hampshire grower is also supplying Alitex and Gaze Burvill who are collaborating for 2013.
RHS show garden judge Andrew Wilson and his fellow designer Gavin McWilliam have asked Hortus Loci to source and grow the plants for their ‘Fresh Garden’.
Hortus Loci directors Mark Straver and Robin Wallis have planted a hectare of land at Hortus Loci with more than 400 species of plants for the show.
They say the look for 2013 is for a more wild and naturalistic feel.
"Less is apparently more for 2013 with things being much less primped and preened than in recent years.," the directors said.
Added Straver: "Chelsea may have its own Olympic legacy with lots of British natives and original varieties incorporated."
Wallis said: "It’s all about food, home grown plants such as herbs and other edibles for culinary use and outdoor entertaining."