1 Banners, bunting, live animals, mirrors and artificial plant material all need special permission from the Show manager before they can be used in Chelsea’s show gardens.

2 Alliums are the most-used show garden plant, followed by box, ferns, geraniums, lupins, geums and black-stemmed cow parsley. At last year’s show, 52 rose plants featured, mainly pink.

3 Designers are not allowed to plant bulbs or corms in the show gardens without special permission. Nor are show gardens allowed to feature audio visual installations.

4 Last year more than 53,038 hot drinks were consumed at the show. Coffee sales overtook tea sales for the first time in Chelsea history; cappuccino sales peaked on Thursday.

5 All the gardens are built from scratch in just 19 days. Many of the gardens are ‘no dig’ sites, where the build teams have to create the garden on top of the existing show ground soil.

6 The Chelsea Flower Show has been held in the grounds of the Royal Hospital Chelsea, London every year since 1913, apart from gaps during the two World Wars.

7 he Great Pavilion, formerly known as the Floral Pavilion and the Great Marquee, measures roughly 6,000 sq metres, which would give enough room to park 250 London buses.

8 In 1932 rain was so hard that a summerhouse fell to pieces. Hailstones were so large they blocked the drains and caused flooding. An exhibitor named it ‘The Chelsea Shower Flow’.

9 Of the firms that exhibited at the first Show in 1913, three can still be seen at the Show today: McBean’s Orchids, Blackmore & Langdon and Kelways Plants