Prize-winning crossword

When all the answers are in place, the letters in the odd-numbered squares from 1 to 19 and 25 to 31, and the even-numbered squares 20 to 26 will spell out three words that can be followed by 12 across in flower names.

ACROSS

1 Wildflower with ‘greater’ and lesser varieties (9) 6 Cheque counterfoil (4) 10 Made improving changes to (8) 11 Relation between two amounts (5) 12 Word that can follow the three hidden words (4) 13 Members of movement founded by Baden-Powell (3,5) 18 National Trust garden and unfinished garden lodge in Northamptonshire (7) 20 French abbess, and tragic lover of Abelard (7) 24 Trustworthy, reliable (9) 27 Vegetable of the genus 22 down (4) 28 Bu er-making machine (5) 30 Most hazardous (8) 31 Sicilian volcano (4) 32 Aromatic plant of the daisy family (9)

DOWN

2 Number represented by the Roman numerals XI (6) 3 Greek god, and award-winning variety of Mahonia aquifolium (6) 4 Take troops out of active service, in short (5) 5 Enid Blyton character (5) 7 ‘Blue’ garden bird (3) 8 Look at superficially (6) 9 Placed upright, built (7) 14 Nocturnal birds of prey (4) 15 Second-hand (4) 16 Fibre of the cannabis plant (4) 17 Sequence of actions regularly followed (7) 19 Loud, sharp cry (4) 21 Workplace nursery (6) 22 Onion genus (6) 23 Tall, prickly plant with spiny flower heads (6) 25 Tree of the genus Betula (5) 26 Derby racecourse (5) 29 Tall vase with stem and base (3)