These were the findings of the Farm Business Survey 2013-14 of horticulture production in England from Rural Business Research and the University of Reading.
Richard Crane, agriculture and food team researcher at the University of Reading, attributed ornamental horticulture's results in 2013 to the weather.
"The 2013-14 report has not been a lot better for hardy nursery stock and bedding producers," he said. "It was similar to the year before, which is in some ways a little bit surprising because summer 2013 was a better year, though there was a very late spring, which could be the reason why there was not much improvement.
"In 2012 there was a bad washout after a decent spring post-May, which meant reduced sales, and in 2013 it was a very late spring so there were lost sales in that period. I hope the 2014 year we're costing now is a better year thanks to the better weather."
The survey found that in 2013 output from horticulture was up four per cent at £3.007m from £2.877m, with non-edibles up four per cent and field vegetables up five per cent.
In 2013 there was a 19 per cent increase in orchard fruit output but a £14m (four per cent) drop in soft-fruit output, after a 190 per cent increase over the past decade thanks to areas grown under glass. Spanish tunnels grew by 55 per cent (79ha) compared to 2003.
The average farm business income (FBI) of horticultural businesses in 2013-14 increased by 30 per cent from 2012 to £33,925.
FBI increased by 30 per cent to £33,900 per business in all horticulture sectors in 2013-14 compared to 2012-13, when there was a 43 per cent decrease in average FBI between 2011-12 and 2012-13. Expenditure on young plants, fertilisers, composts and glasshouse fuel all fell, while summer 2013 weather and its economy was better than in 2012.
In value terms, total output from non-edibles was £1.097m in 2013, up four per cent on 2012.