But wild bird food sales rose by at least 10% across the board.
Garden centre Epos figures research by Horticulture Week showed HTA National Garden Gift Voucher sales fell by around 4% as garden centres suffered lower footfall in the bad weather.
Spring favourite the Primula saw sales fall around 30% as gardeners failed to find weather good enough to do much outdoor planting.
But young plants sales grew slightly, as did compost, including Westland Multipurpose 75 litre Levington Multipurpose.
Lawn feeds sales remained static while mini greenhouse sales fell by 25%.
Garden centre sales fell by 10% in March compared to 2009 and were 6% down in the year to 31 March.
But many centres say sales have picked up in April and could still match 2010, when average garden centre turnover beat 2008 by 10% over the year.