In particular there was an increase in sales of bedding plants in comparison to the same time in 2014.
The HTA said: "This could be due to better weather over the Easter bank holiday weekend in April, the met office reported less rain and more sunshine on average in April 2015 in comparison to the previous year.
"Improving economic conditions could also be a factor in higher sales. The HTA Q1 member voice survey which tracks how garden retailers feel about their business’ prospects in the coming 12 months reported retailer confidence levels as 6 from a scale of 1 (very negative) to 7 (very positive)."
GCA chief executive Iain Wylie said the second May bank holiday had been a "good solid weekend" but with "no records broken". He added: "Given the way May has gone, expectations might not have been high, so it was a nice little boost".
Squires said they were 40 per cent up over the three day bank holiday weekend.
Alton said figures were all positive for all three days with an overall figure of plus nine per cent. The plant sales area was up 38 per cent on 2014 and made up over 32 per cent of total turnover for the bank holiday period.
Scotsdale said it was seven per cent up on the week to 24 May.
HTA figures April 2015 v April 2014
- Outdoor living 26.8 per cent up
- Pets and aquatics 19 per cent up
- Gifts 18 per cent up
- Bedding 14 per cent up
- Plants 10 per cent up
- Landscaping 10 per cent up
- Growing media 9 per cent up
- Seeds and bulbs 9 per cent up
- Garden care 6 per cent up
- Catering 4 per cent up
April 12 per cent up
Year to date 4.5 per cent up