Prize-winning crossword

The letters in the evennumbered squares will spell out the botanical name of a shrub; its common name is spelled out by the letters in squares numbered 1, 14, 4, 20, 32 and 12, and its most popular use is given in 19 down.

ACROSS

5 ‘Red ___’, award-winning small variety of Acer palmatum (5) 8 Fishing village on Loch Broom (8) 9 2 down stream of water (5) 10 Excessively self-satisfied (4) 11 Plant name that can be preceded by ‘garden’, ‘rock’ and ‘water’ (5) 12 Fasten with string (3) 15 South Cornwall port (8) 18 ‘Li le ___’, popular variety of kniphofia (4) 20 Completely empty space (4) 21 China tea flavoured with bergamot (4,4) 22 Flying saucer? (1,1,1) 27 ‘Blue ___’, award-winning variety of hosta (5) 28 Type of soil with a pH of less than 7 (4) 30 Rule as monarch (5) 31 Substance that provides food for health and growth (8) 32 Rub out (5)

DOWN

1 Stone fruit of prunus (4) 2 Of considerable size (5) 3 Type of coarse grass with long creeping roots (5) 4 Against the law (7) 5 Edible very sweet fruit like a large tomato (9) 6 Hand over, donate (4) 7 Garden in America (4) 10 Piece of furniture like a 3 down (6) 13 Title of a Muslim, mainly Arab, ruler (4) 14 2 down 9 across forming part of the USA/Mexico border (3,6) 16 Official language of Pakistan (4) 17 King of England in 1066 (6) 19 Main use of the hidden shrub (7) 23 Variety or species name meaning tall (5) 24 Larch genus (5) 25 Aloe vera, literally ‘___ aloe’ (4) 26 Egyptian location of the pyramids and sphinx (4) 29 Inner Hebridean island associated with St Columba (4)