The best performing traditional category was houseplants at 8.36 per cent up.
Gift sales were up 0.13 per cent and pets and aquatics were up 6.19 per cent. Hard landscaping sales were down -0.94 per cent and furniture and barbecue sales were up 7.0 per cent. Sundries sales were up 2.93 per cent.
GCA chief executive Iain Wylie said: "It’s not a surprise to see the non-traditional food hall and farm shop category taking top spot in sales during the month as due to the poor, wet weather and early Easter break, many gardeners haven’t had the chance to get working on their plots.
"As the Easter break was so early this year the month’s sales figures aren’t a like-for-like comparison on last year. Easter figures would have been much better if it was a couple of weeks later.
"Due to there being no Easter break in April it has been a more challenging month but as we move into the late spring and early summer we’ve got our fingers crossed that things, including the weather, will improve."
The GCA represents nearly 200 garden centres nationwide.