Show organiser Geoff Caesar, managing director of Bransford Webbs Plant Company, said: "We're now getting regular visitors to the show and they are buying plants for immediate delivery, which is the whole purpose of the fair. Originally people were just coming to have a look."
Caesar added that he had received good feedback from growers exhibiting and that the fair was working well at its new venue Stoneleigh Park, where the organisers had been "very supportive".
"The issue for us now is getting the date right and avoiding being unlucky with the weather again," said Caesar.
Last week's event was laid on as an extra show after snow prevented some exhibitors and visitors from attending the February fair.
"If we get the date right we know we can pull in at least 150 firms and sell over £40,000 worth of plants, so we will sit down after the June fair and decide when it would be best to hold the fairs in 2010."
British Plant Fairs will also be held at Stoneleigh Park on 11 June and 13 August. They are organised by the Midland Regional Growers group.