Bord na Mona and Catering Projects are the two latest sponsors of the awards, which now have an extended entry deadline of 25 July.
New Bord na Mona UK head Steve Harper said: "We are delighted to be supporting the Garden Retail Awards. In the next six-to-nine months we want to make the industry aware we are here and serious about the UK garden retail market."
Harper is focusing on the Growise and Vital Earth brands to develop in UK garden centres. He said: "We want five per cent of the market fairly rapidly and to build from that."
Catering Projects works with YO! Sushi, Odeon Cinemas, Byron Hamburgers, Giraffe, Nando's, Frankie & Benny's and Delice de France on kitchen fit-outs. Representative Sarah Cottle said: "Catering Projects has tonnes of heritage in the retail sector and has been watching the garden centre sector.
"We recently appointed a specialist who has been in garden centre project management for 15 years as accounts manager. We've married her specialist knowledge with our retail knowledge and are keen to build our profile via the Garden Retail Awards.
The awards are run in association with the HTA and sponsors confirmed to date include Quinton Edwards, Briers, MorePeople, Sinclair Horticulture, Solex, Town & Country, Westland, Bord na Mona and Catering Projects.
The presentation will take place at Grosvenor House in London on Tuesday 5 November.
For further information about the awards, call Keith Bawden on 020 8267 4014 or email keith.bawden@ haymarket.com.
To enter the awards, go to www.gardenretailawards.com and click on "Enter Now" to complete the online entry form.