Many thanks for supplying this puzzle to John Henderson, who supplies quizzes to The Elephant Inn, The Old Dairy, The White Hart and The Alma, as well as crosswords to several national newspapers. Crossword Links can be found at JETdoc.
A Nature Link
Initials of the ten correct answers in order, followed by the ten designated letters in order, supply the theme.
1 (4) Weather warning waved by Corbyn? (3,4)
2 (3) Evergreen German wine (9)
3 (3) Avalanche? (8)
4 (3) Mistake by Ermintrude or Buttercup? (7)
5 (2) Lead singer of the Little People? (7,5)
6 (6) Endless Oriental festival with eggs (6)
7 (5) Pure brutishness from this O’Grady creation (4,6)
LINK 6&7, though both stand alone
8 (2) Imitation Blarney Stone symbolic of Ireland (8)
9 (3) Gods… (a) Love sore back (4);
(b) Hell – electronic picture puzzle (6)
10 (2) Q: Who’s the lonely lady sitting out the dance? (1,10)
Answers (LINK: RHS CHELSEA FLOWER SHOW)
1 RED FLAG R F
2 HOLLY/HOCK (also Holly) H L
3 SNOWDROP S O
4 COW/SLIP C W
5 HEATHER SMALL ref M People H E
6 E/ASTER(n) E R
7 LILY SAVAGE (Easter Lily) L S
8 SHAM/ROCK S H
9 EROS/E-REBUS E O
10 A: WALLFLOWER A W