Possible Clues:

• Change in climate’s doing for flower
• Climates (anag.)
• Flowering vine such as virgin's-bower or traveller's joy
• Plant that makes cat smile
• One climbs over it — a member of 12 second
• Climber's claim set to collapse
• Where man meets machine
• Mountain top -- scale it after a fashion being a climber
• Flowering plant that's requiring a switch in types of weather
• Projection for securing rope is holding male climber