Prize-winning crossword

When all the answers are in place, the letters in the even-numbered squares will spell out the connected names of three varieties of rhododendron.

ACROSS

3 Folding climbing frame (10) 9 City, Vikings’ Jorvik (4) 10 Unwelcome burrowing animals (5) 12 Woody evergreen climbing plant (3) 13 Author of The War of the Worlds (1,1,5) 16 Simple aquatic plant – seaweed for example (4) 18 ‘Li le ___’, Dickensian variety of clematis (4) 20 Shelled mollusc (5) 22 Meaning of the species name nutans (7) 23 See 8 down 25 Window pane sealant (5) 26 Garden walkway? (4) 28 Greek god of love (4) 31 Common name of Leptospermum scoparium, also known as mānuka (3,4) 34 Tune, melody (3) 35 To do with the Moon (5) 37 James ___, late American film actor… (4) 38 …and his 1955 film, with Adam and Eve to the west? (4,2,4)

DOWN

1 Traditional story (4) 2 Pointed front of a ship (4) 4 ___ Motown, US record label (5) 5 Chum (3) 6 As well (4) 7 Road leading to a house (5) 8 and 23 across ___ Gardens, Kew (5,7) 11 Capital of Norway (4) 14 Venetian canal boat (7) 15 Tombstone inscription (7) 17 Succulent with a rose e of leaves (4) 18 Ain’t ___, Jimmy Nail’s only No 1 hit, in 1992 (2,5) 19 Andre ___, Versailles garden designer (2,5) 21 Coniferous tree (4) 24 Very small amount (4) 26 London ___, tree (5) 27 Biblical weeds (5) 29 Hit a tennis ball to begin play (5) 30 ___ Laine, jazz singer (4) 32 Water grass (4) 33 Sicilian volcano (4) 36 French word meaning born (3)