The figures show how garden centres bounced back, despite having catering, leisure and events closed for long periods.
The analysis of the top 175 garden centres, their suppliers, buyers, regional distribution, turnover and new developments has grown since launch in 2010.
This year's is the biggest yet and once again Longacres, in Bagshot, Surrey, is named the UK's biggest turnover centre, at £25.9m.
Garden retail has coped with the impact of the pandemic, with many centres showing better than expected results.
Top 10 for 2021
1. Longacres Bagshot
3. Dobbies Woodcote Green
4. Webbs of Wychbold
5 Burford Garden Company
5 Scotsdales Garden Centre
7. Garsons Esher
8. Hayes Garden World
9. Ruxley Manor
10. East Bridgford Garden & Home (Blue Diamond)
Subscribers can read the exclusive and unrivalled eleventh edition of the award-winning Horticulture Week's analysis of the garden retail market in the new print edition, out now. The report is also available online - see below.
Horticulture Week is also set to launch a comprehensive guide to all the garden centres in the UK, available exclusively to subscribers, later this autumn.